I'm from Venezuela and today they celebrate carnival so I decided to make a Gaang Headcanon in this celebration
•Sokka and Zuko would be the typical duo where one makes foam or water and the other throws confetti, obviously Sokka is the one who makes water or confetti and Zuko throws confetti and if someone returns the prank Sokka takes out his secret foam can and he foams double and Zuko throws double confetti
•Aang would not participate since he thinks that the carnival is a somewhat aggressive festival, but if someone attacks Appa with foam or confetti (which in this case is a dog), he attacks with his foam canister that he hides in his backpack.
•Toph LOVES the carnival because she can get dirty and play pranks on people so normally she would join the Sokka and Zuko duo by having Sokka throw water at people and she throw foam
• Katara and Suki don't care about the carnival, but if someone is too funny, they both attack with foam without mercy, regardless of whether foam falls on their face, mouth, or eyes.
•At the end of the day everyone goes to eat at a hot dog stand and starts chatting and telling funny stories.