It is funny I posted this yesterday morning, because yesterday evening (July 4th) we went to Great Meadow park in The Plains, VA for fireworks and festivities, and found this!!!!
http://novaar.org/drupal/index.htmlPlus they had an truly awesome series of rockets go up - and come down, of course. I was really glad to see ds7 freaking out about this nearly as much as me

Rockets are just too cool
We are planning on attending the next one, which I think is a two day event, 7/12 and 7/13, same location. If ds's interest is still high, I think we will join.
...added event to calendar.