OOPSLA, held annually in the United States in the fall season, is usually a significant conference for Squeakers. A Squeak "Birds Of a Feather" (BoF) session is always held one evening during OOPSLA.
Camp Smalltalk, held periodically. This is gathering of people working in all varieties of Smalltalk, Squeak included.
SqueakNic in Switzerland in Berne (for dates contact Alexandre Bergel)
Squeak Events A Squeak-End at Georgia Tech in the spring of 2002! (In coordination with the NSF-sponsored multimedia construction workshop in CompSci education using Squeak)