Keeping kids busy at wedding

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My cousin is getting married soon. It's about a 4 hour drive so it's an overnight thing. My kids are invited and going. (4&2)

I bought Crayola Color Wonder packs. I'll have different snacks. What are some other things that anyone can recommend? My 4 year old is very calm and listens well enough but I'm sure after a while will be over it. It's my 2 year old that I'm a little more worried about though. She's my wild one. Lol.