anytime is great for a GT, but if you want the maximum turnout, i think out of the dates given, June 26 is best. June 5 is kinda soon, June 12 is the GP weekend and the HDLM will be PACKED already,not to mention out of towners not willing to fork over 3-4 times the avg. cost of a hotel room. June 26 would give more time to get people interested, both Indy's, Agencies, and of course people from Merb.