Jwest,
I like the idea and definitely think it's worth doing and waiting a little bit might be the best bet since there are a lot of GBs and ideas floating/competing for participants at the moment.
Off the top of my head I currently know of the StuG GB starting the 16th (Monday), the Mad Allied Day (possibly Aug 29th), the T-34 Mad Day TBD but kicking around Sept dates, the Mad Fokker Day on Oct. 17th, and the Bulge GB on November 1. Lots of things happening in a short space of time to try to coordinate and organize simultaneously. That's not necessarily a bad thing as it shows a lot of variety and activity but it does make for a crowded field.