I have attended this party 4 times in the last few years.
You can get into the MK around 4 pm and the party goes until midnight. Like the Xmas party, it is a hard ticket event and crowds are reasonable in September.
You cannot wear costumes that are gory or cover your entire face with a mask.
I don't have kids, but I dress up anyway. It is so fun to attend in costume!
There are lots of characters and villains out for photo ops.
Here is a link with tons of info.
http://allears.net/tp/mk/mnssh.htm
[FONT=Verdana, Arial, Helvetica, sans-serif]Villain's Mix and Mingle shows at the Castle Stage:[/FONT]
[FONT=Verdana, Arial, Helvetica, sans-serif]7:45, 9:00, 10:05, and 11:15[/FONT]
[FONT=Verdana, Arial, Helvetica, sans-serif]Character Greetings take place from 7 – 11:30.[/FONT]
[FONT=Verdana, Arial, Helvetica, sans-serif]Hallowishes Fireworks at 9:30pm.[/FONT]
[FONT=Verdana, Arial, Helvetica, sans-serif]Parade at 8:15 and 10:30.[/FONT]