One of our activities for our youth was to meet at a local Grange hall and just spend time with each other. We had make your own pizza for dinner, and had plenty of snacks! We had a Wii that had many choices of games. And we also enjoyed playing musical chairs.
This way, there is no set time for anyone, and they could come and go as they please. Everyone liked to be relaxed and could have choices on what they wanted to do.