
Some seminars:
 Harvard/MIT Algebraic Geometry seminar (I'm one of many organizers.)
 Boston College Algebraic Geometry and Number Theory Seminar
 Baby Algebraic Geometry Seminar, the seminar organized by graduate students.
 Algebraic Geometry Learning Seminar, a thematic seminar also organized by graduate students.

Some conferences:
 AGNES
 Ravi Vakil's list of conferences in algebraic geometry.