The 4th Battle O'Baltimore planning committee is already meeting and the date will probably be set by next week. Historically been in August. Great sponsors. Great teams. Great volunteers.
There is a lot of collective wisdom learned by those running the off-season events in VA, PA, NJ, (DE in NJ), NY and MD. Many of us share the NASA-GSFC field.
One suggestion is to have some key people from your planning committee shadow a couple of events this year. We'd be happy to show you how it's done at the BoB.
http://www.battleobaltimore.com/