I checked out a few chapter websites and (not surprisingly) they were mostly unhelpful - although it may still be early for summer rush schedules to be posted. Some websites had forms for interested men to fill out, and the IFC website has all of the Rush Chairmen's contact info. Your son can e-mail them to find out about summer rush.
Are you sure your son doesn't know anyone from high school that went to UGA? Have him double check, as well as ask his friends if they have any friends or family members at UGA. As I'm sure you understand, summer rush can be important to getting a bid.
Also, check out this thread:
http://www.greekchat.com/gcforums/sh...hlight=Georgia