Family Reunion Dates

Liz and I are trying to figure out venues for the family reunion. Before we can do that, we need to have a date in mind. As such, I need everyone's help! If you could please post dates that you know right now you could NOT attend, that would be greatly helpful. We are looking at weekends from the middle of July through the middle of August. We understand that thing will come up and change, but we need to at least have some sense. If everyone could do this in the next few days, that would be great! Thanks!