Main Street usually stays open 1/2 hour to an hour after the park closes. They let you meander out. They will gently move the crowd toward the front of the park the later it gets. One time, a couple of years ago, Stephen and I were talking with some Disers we'd met a few days prior, Brandy and her new husband. We kept running into them, it was too funny. We were in MK, and just standing and talking on the bridge to Tomorrowland, after the fireworks. A CM approached us and asked if we were having a problem. When we answered no, we were informed the park was closed and please proceed to the front of the park. It was pretty funny to be kicked out of MK. The CM was very nice. I think if we were on Main Street, where most of the crowd was, we would not have been approached.