1. Presented a paper in the VIII Ramanujan Symposium on Recent Developments In Nonlinear Systems held during 14-16 Feb 2001 at The Ramanujan Institute For Advanced Study In Mathematics, University of Madras, Chennai, India.
2. Participated in the national conference on Contemporary Issues In Nuclear And Particle Physics held during 14-15 Dec 2001 in the Department of Physics, Jadavpur University, Kolkata-700 032, India.
3. Presented a paper in the Seminar on Recent Advances in Mathematical Physics held during 12-13 March 2002 in the Department of Applied Mathematics, University of Calcutta, India.
4. Presented a paper in a UGC-DSA Programme held on 25 March 2003 at the Department of Applied Mathematics, University of Calcutta, India.
5. Participated in the DST sponsored First National Workshop on Techniques in Applied Mathematics held during 18-28 Oct 2005 in the Department of applied Mathematics, University of Calcutta, India.
6. Participated in and completed the 2007 Summer College on Plasma Physics held during 30 July -24 Aug 2007 at The Abdus Salam International Centre for Theoretical Physics, Trieste, Italy.
7. Invited talk in the seminar on “Recent Trends in Theoretical Physics and Applied Mathematics” held on 29 September 2007 at the Institute of Theoretical Physics, 4/1, Mohan Bagan Lane, Kolkata-700 004, India.
8. Invited talk in the workshop on “Mathematics and Contemporary Physics” held on 25 January, 2008 in the epartment of Mathematics, Jadavpur University, Kolkata-700 032, India.
9. Participated in and completed the International workshop on the Frontiers of Modern Plasma Physics held at The Abdus Salam International Centre for Theoretical Physics, Trieste, Italy during 14.07.2008 to 25.07.2008.
10. Jt. Convener in the three-day National Seminar on “Advances in Nonlinear Systems” held in the Department of Mathematics, Visva-Bharati University, Santiniketan, India during February 21-23, 2009.
11. Participated in and completed the Summer College on Plasma Physics held at The Abdus Salam International Centre for Theoretical Physics, Trieste, Italy during 10.08.2009 to 28.08.2009.
12. Invited talk titled "Wave-wave interactions in quantum plasmas" in the International Advanced Workshop on the Frontiers of Plasma Physics (5-16 July,
2010), The Abdus Salam ICTP, Trieste, Italy.
13. Invited talk titled "Spin-ponderomotive force in plasmas" in the International Advanced Workshop on the Frontiers of Plasma Physics (5-16 July, 2010), The Abdus Salam ICTP, Trieste, Italy.
14. Participated in the 6th International Conference on the Physics of Dusty Plasmas (ICPDP2011) (May 16-20, 2011; Garmisch-Partenkirchen, Germany).
15. Committee member and Invited talk titled "Stability and evolution of wave envelopes in strongly coupled degenerate plasmas" in the International Topical Conference on Plasma Science: Strongly Coupled Ultra-Cold and Quantum Plasmas (Sept. 12-14, 2011; Lisbon, Portugal).
16. Committee member in the National Seminar on Nonlinear Aspects of Analysis & Algebra (NAAA-2012) (March 24-25, 2012; Department of Mathematics, Visva-Bharati University, Santiniketan, India).
17. Invited talk in the Departmental Seminar of Department of Mathematics & Statistics, IISER Kolkata (28 March, 2012) Haringhata, Nadia, India.
18. Invited talk in the National Seminar on Mathematics & Applications (NSMA-2012, 28-29 March, 2012), Department of Mathematics, The University of Burdwan, Burdwan, India.
19. Committee member in the International Topical Conference on Plasma Science: Advanced Plasma Concepts (Sept. 24-28, 2012; Faro, Portugal).
20. Invited talk titled "Nonlinear interaction of waves in plasmas: Evolution of spatiotemporal chaos" in the National Workshop on Nonlinear Waves: Theory and Simulation (14-18 January, 2013), Department of Mathematics, National Institute of Technology, Durgapur, India.
21. Committee member in the National Seminar on Mathematics for nonlinear systems, Department of Mathematics, Siksha Bhavana, Visva-Bharati, Santiniketan, India (17-18 March, 2013).
22. Invited talk titled "Modelling of quantum plasmas: some applications" in the International conference on nonlinear science and engineering (23-24 Dec, 2013), College of Engg. & Management, Kolaghat, India.
23. Presented a paper in the 3rd Internal Conference on Mathematics & Applications (28-30 January, 2014), Department of Mathematics, University of Burdwan, Burdwan, India.
24. Presented a paper in the National Conference on Emerging trends in physics of fluids & solids 06-07 March, 2014), Department of Mathematics, Jadavpur University, Kolkata, India.
25. Presented a paper in the 3rd International symposium on Complex dynamical systems and applications (10-12 March, 2014), Indian Statistical Institute, Kolkata, India.
26. Convener in the National seminar on Recent perspectives on nonlinear mathematics & Applications (25-26 March, 2014), Department of Mathematics, Visva-Bharati University, Santiniketan, India.
27. Presented a poster titled "Nonlinear Landau damping and wave modulation in a nonextensive pair plasma" in the 30th National symposium on Plasma Science and Technology (1-4 Dec., 2015), Saha Institute of Nuclear Physics, Kolkata, India.
28. Invited talk titled "Generation of rogue waves in geophysical fluids and plasmas" In the National seminar on Nonlinear & Complex Phenomena on Plasmas and Fluids (21 Jan., 2016), Centre for Plasma Studies, Jadavpur University, Kolkata, India.
29. Invited talk titled "Landau damping of wave envelopes in pair plasmas" in the 4th International conference on Complex Dynamical Systems & Applications (15-17 Feb. 2016), NIT, Durgapur, India.
30. Committee member and Convener in the National Conference on Computational Mathematics and Nonlinear Dynamics (19-21 Feb 2016), Department of Mathematics, Visva-Bharati, Santiniketan, India.
31. Invited talk titled "Nonlinear Landau damping and modulation of electrostatic waves in pair plasmas" in the International Conference on Frontiers of Physics and Plasma Science (FPPS-2016) (7-8 Nov 2016), Ujjain Engg. College, Ujjain, MP, India.
32. Invited lectures titled "Basics of dusty plasma theory" in the DST-SERB School on Plasma Theory (9-29 Nov 2016), IASST, Guwahati, India.
33. Presented a paper in the International Conference on Nonlinear systems and Dynamics (16-18 Dec 2016), IISER Kolkata, India.
34. Invited talk titled "Landau damping due to group velocity and multi-plasmon resonances in plasmas" in the national seminar on Recent developments in plasma physics (27 Feb 2017), Jadavpur University, Kolkata-700 032.
35. Invited talk titled "Nonlinear interaction of high-frequency and low-frequency waves in plasmas" and Scientific advisory committee member in the National conference on Plasma physics and nonlinear dynamics 2017 (23-24 March 2017), JIS University, Agarpara, Kolkata.
36. Committee member in Collaborative conference on Plasma Physics (CCPP) (4-8 September 2017), Budapest, Hungary.
37. Invited talk titled "Nonlinear Landau damping of electrostatic waves in quantum plasmas" in the 1st Asia-Pacific conference on plasma physics (18-23 September 2017), Chengdu, China.
38. Invited talk titled "Nonlinear interaction of waves in plasmas-a simulation approach" in the 32nd National Symposium On Plasma Science & Technology (7-10 November 2017), Gandhinagar, India.
39. Invited talk titled "Revisiting Mathematics-past, present and future" in memory of Srinivasa Ramanujan (8 March 2018), Mugberia Gangadhar Mahavidyalaya, Mugberia, Purba Medinipur, India.
40. Delivered a series of lectures on Nonlinear Landau damping and surface waves in plasmas (17 to 22 April 2018), Department of Physics, Guru Nanak Dev University, Amritsar, India.
41. Invited talk titled "Nonlinear differential equations: Applications to biological and physical sciences " (28 September 2018), Amity University, Kolkata, India.
42. Invited talk titled "Surface plasmons in a massless Dirac plasma" in the 2nd Asia-Pacific conference on plasma physics (12-17 November 2018), Kanazawa, Japan.
43. Invited talk titled "Surface plasmon in graphene and semiconductor plasmas" in the International conference on Photonics, Metamaterials & Plasmonics (PMP-2019, 14-16 February 2019), Jaypee Institute of Information Technology (JIIT), Noida, India.
44. Invited talk titled "Wakefield generation and the formation of EM soliton in relativistic plasmas" in the 22nd National conference on atomic and molecular physics (25-28 March 2019), IIT Kanpur, India.
45. Invited talk titled "Mathematical theory and structures of nonlinear waves in plasmas" in the international conference on applied mathematics in science and engineering (24-26 Oct 2019), SOA University, Bhubaneswar, India.
46. Invited talk titled "Stimulated scattering in relativistic plasmas" in the 3rd Asia-Pacific conference on plasma physics (AAPPS-DPP2019, 4-8 November 2019), Hefei, China.
47. Committee member in the 12th international conference on plasma science and applications (ICPSA 2019, 11-14 Nov 2019), University of Lucknow, India.
48. Invited talk titled "Stimulated Raman and Brillouin scattering instabilities in degenerate plasmas", chaired a session and evaluated posters in the 14th Asia-Pacific Physics Conference (APPC2019, 17-22 Nov 2019) Kuching, Malaysia.
49. Invited talk titled "Mathematics and its application in nonlinear sciences" in the celebration of National Mathematics Day (132nd Birth anniversary of Ramanujan, 23 Dec 2019), Deptt. of Appl. Maths. with Oceanology and Computer Programming, Vidyasagar University, India.
50. Invited talk titled "Mathematical theory and structures of nonlinear waves in fluids and plasmas" in the International conference on Mathematical sciences and applications (ICMA-2020, 27-29 Jan 2020), Department of Mathematics, Sacred Heart College, Tirupattur, India.
51. Invited talk titled "Generation of wakefields and electromagnetic solitons in degenerate plasmas" in the Scholars Colloquium on Plasma Physics (econference, 3-11 Sept 2020), organized by Physics Joint, Kolkata-32, India.
52. Invited talk titled "Landau damping due to multi-plasmon resonances in a degenerate plasma: A new nonlocal KdV equation" in the international econference on Plasma Theory and Simulations (PTS-2020, 14-15 Sept 2020), organized by the Department of Pure and Applied Physics, Guru Ghasidas Vishwavidyalaya, Bilashpur, India.
53. Invited talk titled "Optical Dyakonov surface plasmons at a metal-crystal interface", organizing committee member in the 5th Asia-Pacific Conference (econference, AAPPS-DPP2021) on Plasma Physics (26 Sept-1 Oct 2021), organized by the Division of Plasma Physics (DPP), Association of Asia-Pacific Physical Societies (AAPPS).
54. Invited talk titled "Importance and applications of mathematics in nonlinear sciences" in the 134th birth anniversary of Srinivasa Ramanujan Iyengar (National Mathematics Day, 22 Dec 2021), organized by the Department of Mathematics, Visva-Bharati, India.
55. Invited talk titled "Nonlinear dynamics of gravity waves in the Earth's ionosphere" and chaired a session in the International conference on nonlinear dynamics and applications (ICNDA, 9-11 March 2022), organized by Department of Mathematics, Sikkim Manipal Institute of Technology, India.
56. Invited talk titled "Chaotic dynamics and complexity of dispersive Alfvén waves in a magnetoplasma" and judged a poster session at the 2nd International Conference on Plasma Theory and Simulation (PTS, 20-22 June 2022), organized by the Department of Physics, University of Lucknow, India.
57. Keynote speech titled "Classical and quantum kinetic theories of wave-particle interactions in plasmas" at the 9th Iranian Plasma Engineering and Plasma Physics Conference (IPEPPC, 13-14 July 2022), organized by Gonbad Kavous University, Iran.
58. Invited talk titled "Instability of thermoacoustic shocks in fluid plasmas " and chaired sessions at the 6th Asia-Pacific Conference (e-conference, AAPPS-DPP2022) on Plasma Physics (9-14 Oct 2022), organized by the Division of Plasma Physics (DPP), Association of Asia-Pacific Physical Societies (AAPPS).
59. Invited talk titled "The role and significance of mathematics in physics and nonlinear sciences" at an extension programme (6 Dec 2022), organized by the Department of Mathematics, Scottish Church College, Kolkata.
60. Invited talk titled "Chaos and complexity in the dynamics of nonlinear MHD waves" at the workshop in an outreach program (22 Dec 2022) jointly organized by the Department of Mathematics, Visva-Bharati, India, and IIT Ropar, India.
61. Invited talk titled "Stability of electromagnetic solitons in relativistic degenerate plasmas" and International organizing committee member at the 15th International Conference on Plasma Science and Applications (ICPSA2022, 28-30 Dec 2022), organized by the Asian African Association for Plasma Training (AAAPT), hosted by Gauhati University, India.
62. Invited talk titled "MHD instabilities in presence of neutrino flavor oscillations" and Scientific programme committee member at the 3rd International conference on Plasma Theory and Simulations (PTS-2023, 21-23 Sept 2023), organized by the School of Physical Sciences, Jawaharlal Nehru University, New Delhi, India.
63. Invited talk titled "Mathematics in nature and the influence of philosophy on mathematics" at Teachers' Seminar (8 January 2025), organized by the Department of philosophy and comparative religion, Visva-Bharati, India.
64. Invited talk titled "Nonlinear wave-wave interactions in relativistic magnetoplasmas: Pattern formation and spatiotemporal chaos" and chaired a session at the 4th International Conference on Applied Mathematics in Science and Engineering (AMSE-2025, 2-30 Aug 2025), organized by the Department of Mathematics, Siksha 'O' Anusandhan (Deemed to be University), Bhubaneswar, India and Department of Mechanical Engineering, NIT Arunachal Pradesh, India.
65. Invited talk titled "Gravity in the Earth's atmosphere and astrophysics" at the Department of Physics, Tezpur University, Assam, India, in the celebration of International Gravity Day on 25 September 2025.