You have probably already noticed this great feature in the game!
Disco party is a short-termed mini-game which launches automatically from time to time. The gifts that you see and can win from this game are displayed completely randomly.
To start the prize draw, click on the "Dance" button. This opportunity is given a different number of times, depending on the conditions of the mini-game. If you want more prizes, you can skip the waiting time by purchasing "Skip Timer" from the mini-game menu.