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Lists of upcoming conferences. MathMettings, Kedlaya's one of arithmetic geometry, Number Theory Web's one of number theory, Vakil's one of algebraic geometry
Mailing lists. COWalggeom (Cambridge, Oxford and Warwick algebraic geometry), LNTS (London Number Theory Seminar; send an email to london-number-theory-seminar-request at imperial.ac.uk with subject "help" to subscribe), Am-l (run by Universiteit Utrecht), NMBRTHRY (Number Theory Net)

Links to EGA scanned by Numdam (bibliographic information). I, II, III/1, III/2, IV/1, IV/2, IV/3, IV/4
Links to SGA from various sources (bibliographic information). 1, 2, 3/1, 3/2, 3/3, 4, , 5, 6, 7/1, 7/2

A model-theoretic map of theories
Grothendieck's Récoltes et Semailles
Job listings by country/city
A demonstration of how (at least for now) incredibly useless LLMs are in mathematical thinking