From Toontown Rewritten Wiki
Flippy flipping for fireworks.

Fireworks are explosive devices used for aesthetic and entertainment purposes, commonly seen on New Year's Day, the Fourth of July, and during Cartoonival. When a fireworks show starts, an alert signals the start and the sky fades into darkness.

Toons can also purchase fireworks for their own parties and place them somewhere within the party grounds. Once fireworks are activated, an enormous rocket launches to the night sky.