Maybe look at DYNAMIC and IMPACT tournaments for the fall. There is a September tournament in Northern Virginia called the Gardziel Fall Classic. Sounds perfect for your team's level. Website is:
http://www.gardzielfallclassic.com/index.htmThere is a "contact us" link--just click and contact the organizers directly.
I would tell you that you should not be concerned too much about level of play in even the DYNAMIC and IMPACT tournaments. I have followed four teams over the last five years throughout all sorts of Mid-Atlantic tournaments, and there are good teams to great teams in every one, and sometimes the good teams beat the great ones.