How much money would it be for a group of 23

I spent about 100 on food. And bought the kids the $50 card so I'd say anywhere near $300 and up

A Shitload......

I would say maybe around 600 to 800 dollars , but all depends if you want to play,drink and what you want to eat .

They have rates for parties if you're having a party.

Is the group eating, playing games, or both?

Depends if you're eating as well or just having drinks