Military Through the Ages (MTA) is coming up next weekend, March 21-22, 2009 at Jamestown Fort in VA (near Williamsburg). This is a timeline event from Roman to Modern, open to the public. Each group has or can have a camp and a tactical demo.
It's too late to register a group but for info on coming as a patron (in garb/uniform or civvies):
http://www.virginia.org/site/description.asp?attrID=22866This includes entry to the museum, Native American village and ships. Bring your kids! There's a lot to learn here.