Some links
CIMPA/AESIM School in Belgrade Introduction to Number Theory and Algebraic Curves
Young Number Theorists in Bonn 2023
Number Theory Seminar in Prague
Online Mathematical Dictionary (Visual)
Number theory lunch seminar MPIM Bonn
Max Planck Institute for Mathematics in Bonn
Algebra research group, University of Groningen
Algebra Seminar, University of Groningen
Intercity number theory seminar - number theory seminar in the Netherlands
Mastermath - joint Dutch master program in mathematics
Number Theory Web - number theory news, conferences, websites of many number theorists
Kiran Kedlaya's list of conferences in arithmetic geometry
Roman number theory association
LMFDB - The L-functions and Modular Forms Database
Sage - Open-source mathematical software system
Simons Collaboration on Arithmetic Geometry, Number Theory, and Computation
Mathematical Institute of the Serbian Academy of Sciences and Arts