In park but not going to xmas party

when do we have to officially leave the park if we are in the park but there’s an xmas party that night, is there one final show we can see after 6?

According to what I read, you better hide if you wanna stay later than 6…

Yep, you have to leave at 6, but the park is not as crowded on the days of the party because people know they have to leave at 6.