My DS went to a party a while back.
It was at the house, I gave everyone dinner before I dropped him off except DS because I said "You'll be having party food".
How fecking wrong was I ? 
He got there at the time he was told. I picked him up, and he'd had nothing apart from a small piece of cake.
There was no foiod for him. The party was already in process with relatives and they'd eaten everything.
And I'm not precious about party food- crisps, pop, jelly, ice-cream. Any of that he'd had wolfed down.
I was narked to say the least. If you invite someone to a party , you give them food ! (This was an evening ).
I've never invited a child to my house without offering them a meal or at least a snack and a drink.
And YY, have the food near the end, not before some of the guests have arrived 