A garden of links 

Bilkent Arithmetic Geometry & Number Theory Seminars.

ODTÜ-BİLKENT Algebraic Geometry Seminar.

Leuven Seminar on Number Theory and Algebraic Geometry.

Leuven COSIC (Computer Security and Industrial Cryptography group) Seminar.

Leuven Student Seminars in Mathematics.

Belgian-Dutch Algebraic Geometry Seminar.

Leipzig seminar on Algebra, Algebraic Geometry and Algebraic Topology.

Groningen algebra research seminar.

TGiF (Tropical Geometry in Frankfurt).

Intercity number theory seminar.

DIAMANT (Discrete, Interactive and Algorithmic Mathematics, Algebra and Number Theory).

The Turkish Mathematical Society Distinguished Colloquium Series, videos are here.

Arf Lectures in METU.

UCGEN (Uluslararası Cebirsel GEometri Neşesi).

IMBM (İstanbul Matematiksel Bilimler Merkezi) Number Theory Seminars.

Ankara-Istanbul Algebraic Geometry & Number Theory Meetings.

Gökova Geometry / Topology Conferences.

Türk Matematik Derneği.

Türkiye Matematik Vakfı.

Matematik Dayanışma Platformu.

DRP Turkey.

Matematiğin Peşinde: matematikle ilgili, matematiği öğrenmeyi de paylaşmayı da seven bir topluluk.

MΣΣT a Mathematician: a collection of  video interviews with mathematicians.