How to keep guests cool

Hey all! I’m having my daughter’s 1st bday party this weekend and it’s going to be HOT. Around 90 degrees and probably humid. I am low key freaking out! Is there *any* way to keep guests cool? Do I have to cancel because it will be too miserable? We’re going to bring box fans and I’m thinking of getting spray bottles for water and maybe even towels to keep in a cooler.

Will that be enough or will everyone just hate being there 😅

Also there’s no way to move it inside :( The hall at the park is not an option because it has water damage. And it’s just too many people for our house.

Any creative tips would be more than appreciated!!