Best party I did at that age was in a hall with a bouncy castle.
11-11:15 - bouncing and running around
11:15 - game of musical statues
More bouncing/running around
11:30 - musical bumps
bouncing
11:45 - sleeping lions, go to the loo, wash hands
12:00 - food (will list)
12:15 - cake
12:30 - release a single duvet covers worth of blown up balloons into the room and watch the mayhem
12:45 - maybe another game - hand out party bags
I think we also brought a selection of ride on toys (borrowed lots) and had a drawing colouring table - honestly though, kiddies just loved running around like loons.
Food - This is my tried and tested formula!!
Have melon slices, strawberries, cut up apple on the tables for the children to eat from the beginning when there is no other food - they always eat the lot.
Open sandwiches - I hate making sandwiches and there is so much waste so this is what I do.
Half a bread roll each (I do a mixture of brown and white) most buttered but keep some plain. Lay a slice of ham or some pre sliced cheese (nice one) on top - again, leave some plain. Have sliced cucumber on the side and some carrot sticks with hummus
bowls of crisps
party rings and mini rolls
cake
Capri sun or bottled water - can't be doing with paper cups getting knocked over.
I can do party food for about £40 for 25 children (shopping at waitrose so not really being massively budget conscious)
A five year old wouldnt ordinarily eat half a ham roll, loads of fruit, crisps, two biscuits and a slice of cake for lunch! Something about parties makes people massively overfeed!