This is one of the bonus missions that will not unlock until you complete the story mode. Go to the roof of Stark Tower and you will see the Avengers symbol with party lights around it, enter here to begin the mission. Iron Man will be the ideal character to use for this mission.
Smash all the objects near the center of the room and build the turntables on the left side. In the back of the room, destroy the silver lock and solve the colored puzzle to lower the disco ball. On the right side of the room, destroy the "Stark" sign to reveal elevator controls, once the doors open, break the objects that come out to create the speakers.
Then you will have to go onto the dance floor and walk on the flashing tiles in the correct order, completing this part will end the mission.