A suggestion that might help: how about your sons hang together during the day just doing whatever they want. Maybe later in the evening they take a break from one another and find kids their age to interact with. If they do that on the first night you might be surprised - they might want to hang with kids their age during the day and then talk about it together at night?! All and all, our kids went their seperate ways but we all ended up spending alot of time just hanging out together. They'll have fun, no matter what.
Kim