Well, it's nothing formal. Just a few of us getting together to camp out, shoot bows, slingshots, handguns. Last year Tod brought an atlatl. You can bring a project to work on (we used to build bows, but that was too much like work).
Last few years it's been the first weekend in August, but I think Chad was considering changing that this year, unless he's just plain sick of us all messing up his place;)