Regular closing is 6:00pm. I know the Emporium closes between 6:00pm and 7:00pm, people line up for the 7:00 reopening to get the special party pin. Last year MVMCP guests were asked to go to Tomorrowland after the 6:00pm fireworks until 7:00pm. The rides there were open, don't know about the rest of the park. It used to be they closed the park completely and you had to reenter for MVMCP. Now they try to herd out the regular guests while the MVMCP are coming in at the same time.