After the celebrations have been unlocked through the appropriate code, use one of the follow codes to execute the corresponding celebration.

African Dance: Press LT + B.
Baby Cradle: Press LT + A.
Flying Dive: Press LT + Y.
Ice Skating: Press RB + A.
Prancing Bird: Press RB + B.
River Dance: Press RB + X.
Side Slide: Press RB + Y.