you and the rest of class 1-A are in the sports festival where you fight to show off your quirk for pro-heros

president-mic and principle nezu knew that the heros and audience would get bored. That's where you come in! In between after fight (when the students take a break ore prepare) you would sing and answer questions (you are a famous singer)

you just finished a sing and are now answering questions while the class watched from the tv