I think you just invite the people who in the wedding and parents. And whoever else you want there I guess. But it doesn't need to be formal unless you want it to be. And you could just have a bbq or at a nice quiet resturant/diner. We were thinking of just haing one at our house. And make it an early night. Cuz in the morning your gonna be really busy. My moh and I are actually are leaving from the dinner early to stay at a hotel. And we're doing the same thing for her's next year. That's why we're having it at the house, it wouldn't be so arkward leaving from home then it would from a resturant. And every body could then stay as long as they like without feeling rushed becasue the bride left.