Bloody hell some of you lot are miserable gits!
A little kid is not 'entitled' or some sort of spoilt brat if they are surprised/disappointed that a thing that has in their limited experience, happened at every party they've been to, does not happen...
But hey, to ensure resilience, absolutely zero expectations, make sure they don't get too much sugar, or fat or fun...
Just have the kids turn up, hand over a (brown paper wrapped) gift that can either be a book or something made of wood (and unpainted). All sit in a circle, say happy birthday, then get up and piss off back home.
No need for decorations, party frocks, games, music, birthday tea, party bags...
Neat, simple, educational, cheap and quick. Perfect eh!
I remember party bags and im 43, they were ace. Lump of cake, bag of sweets, bottle of bubbles, hurrah!