[30 Aug–1 Sep 2025] Minimisation of Vaccine Inventory Costs Based on a Discretised SIV-Type Epidemic Model, 10th International Conference on Mathematical Methods, Computational Techniques and Simulation in Engineering (MMCTSE) 2025, Novotel Zeytinburnu, Istanbul, Turkey.

[15–19 Jul 2025] Designing a Health-and-Life Insurance Based on an SIH-Type Epidemic Model Involving Two Groups of Individuals, International Conference on Difference Equations and Applications (ICDEA) 2025, Ramada Pearl Hotel, Guangzhou, China.

[17–21 Jul 2023] The Dynamical System Generated by the Greedy Algorithm, International Conference on Difference Equations and Applications (ICDEA) 2023, Wangchan Riverview Hotel, Phitsanulok, Thailand.

[3–7 Sep 2018] The Mean-Median Map, Dynamics Days Europe, organised by and at Loughborough University, United Kingdom.

[4–8 Jun 2018] The Mean-Median Map, Dynamical Systems, Difference and Functional Equations: In honor of Marek C. Zdun’s 70th birthday, organised by AGH University of Science and Technology, at Hotel Pegaz, Krynica-Zdrój, Poland.

[27 Apr 2018] The Mean-Median Map, Postgraduate Research Day 2018, organised by and at Queen Mary University of London, United Kingdom. (Awarded as the best talk.)

[16–27 Jul 2018] The Mean-Median Map, Summer School in Dynamics, organised by and at International Centre for Theoretical Physics, Trieste, Italy.

[1–4 Aug 2017] The Mean-Median Map, Young Researchers in Mathematics 2017, organised by and at University of Kent, Canterbury, United Kingdom. (Awarded as one of the three best posters.)

[21 Apr 2017] The Mean-Median Map, Postgraduate Research Day 2017, organised by and at Queen Mary University of London, United Kingdom.

[18 May 2019] The History of Recreational Mathematics, organised by British Society for the History of Mathematics, at Birkbeck University of London, United Kingdom.

[26 Apr 2019] Postgraduate Research Day 2019, organised by and at Queen Mary University of London, United Kingdom.

[3 Dec 2016] BSHM Christmas Meeting, organised by British Society for the History of Mathematics, at Birmingham and Midland Institute, Birmingham, United Kingdom.

[1–3 Sep 2016] MATRIX 2016, organised by Maths World UK, at University of Leeds, United Kingdom.

[21 May 2016] The History of Number Theory, organised by British Society for the History of Mathematics, at Birkbeck University of London, United Kingdom.

[29 Apr 2016] Postgraduate Research Day 2016, organised by and at Queen Mary University of London, United Kingdom.

[17 Mar 2016] IMA Mathematics 2016, organised by Institute of Mathematics and its Applications, at Mary Ward House, London, United Kingdom.

[5 Oct 2013] National Mathematics Seminar 2013, organised by and at Parahyangan Catholic University, Bandung, Indonesia.

[6 Oct 2012] National Mathematics Seminar 2012, organised by and at Parahyangan Catholic University, Bandung, Indonesia.

[1 Oct 2011] National Mathematics Seminar 2011, organised by and at Parahyangan Catholic University, Bandung, Indonesia.

[2 Oct 2010] National Mathematics Seminar 2010, organised by and at Parahyangan Catholic University, Bandung, Indonesia.

[8 Mar 2023] Penulisan Matematis (Mathematical Writing), a workshop for middle and high school mathematics teachers, Santa Angela High School, Bandung, Indonesia.

[17 Feb 2022] Penulisan Matematis (Mathematical Writing), a workshop for middle and high school mathematics teachers, Santa Angela High School, Bandung, Indonesia.

[9 Oct 2021] Menuju Suatu Format Ujian Daring yang Bebas Ketidakjujuran (Towards a Dishonesty-Free Online Examination Format), a workshop for middle and high school mathematics teachers, Catholic University of Parahyangan, Bandung, Indonesia.

[9 Jun 2021] Google pun Ternyata Bermatematika! (Even Google Does Mathematics!), Bina Bakti 2 Christian High School, Bandung, Indonesia.

[14 Nov 2020] Mengomunikasikan Matematika dan Mematematikakan Komunikasi (Communicating Mathematics and Mathematising Communication), Department of Mathematics Webinar Series, Parahyangan Catholic University, Bandung, Indonesia.

[23 Jan 2020] Mengajarkan Matematika: PR Kita Bersama (Teaching Mathematics: Our Collective Homework), Forum of High School Mathematics Teachers (MGMP Matematika SMA), Banjarmasin, Indonesia.

[13 Nov 2018] The Mean-Median Map, Dynamical Systems and Statistical Physics seminar series, Queen Mary University of London, United Kingdom.

[7 Mar 2017] The Generalised Sum of Remainders Map, Queen Mary Internal Postgraduate Seminar (QuIPS), Queen Mary University of London, United Kingdom.

[6 Nov 2015] Pemetaan Mean-Median (The Mean-Median Map), Department of Mathematics, Parahyangan Catholic University, Bandung, Indonesia.

[8 Nov 2013] Strategi Pemecahan Masalah Matematika (Strategies of Mathematical Problem Solving), a workshop for middle and high school mathematics teachers, Catholic University of Parahyangan, Bandung, Indonesia.