Does previous years interest you?
In prior years weekends have a lot more locals and people that just arrived. It's a limited ticket event so the crowd isn't really larger or smaller. There is 2 types of crowds, they are either on the rides making the park feel empty because they re in line or they aren't riding anything and the place feels really crowded because everyone is doing the party options. generally it's somewhere inbetween but never down the middle. It'll favor 1 or the other crowd.
I went on a thursday this year and I found the people attending to be lovely and just a great time with no drama or family blow outs.. everyone was really polite and how you wished disney and life would always be. but it was a ride crowd, there was only a brief time while people were busy with stage shows, fireworks and parades where rides were reasonable wait then the reast of the night it was long lines and not worth gonig on rides.