Peter Mayhew (Chewbacca), Jeremy Bulloch (Boba Fett in ESB & ROTJ), Daniel Logan (Boba Fett in AOTC) and Ray Park (Darth Maul) will be guests at CauldronCon 2005, which takes place August 12-14th in Danvers, Massachusetts. Hit the link above for more info. Thanks to Fernando for the alert.
You can check out all the forthcoming conventions and events by date here.