I got a pinata I am going to fill it with either pink hats or blue hats and candy.

There's a ton of cute ideas on Pinterest but my favorite is the one where everyone comes in and chooses either pink lemonade or blue Gatorade or you know whatever drink and that's their gender guess and then after everyone has arrived and sat down you have someone bring out a cake with pink or blue icing in the middle or you film yourself holding a pink and blue onesie and bring the right color to the party and pull it out of a gift bag, or pop a balloon with colored confetti or special order chocolate candy with a colored candy inside. There's lots of fun ideas