With 5 kids, I've seen a lot of parties...
Will it be boys, girls or mixed? Sorry folks, different movies at that age depending on gender.
I see problems for you:
- the kids might be wired and unwilling to sit that long.
- whatever you choose, some will have already seen it.
- some kids at that age are watching Disney only, some are already watching everything their parents rent. Which means it will be hard to pick anything that will please everyone.
If you're still sure you want to go for a movie, you could rent about 5 likely candidates and have the children make the final decision at the party.