you were in class 1A.. the whole class knew you had a crush on aizawa, but he didn't... today was you 18th birthday and it was also the festival, your class decided to sing a song, mina had picked it knowing it was your 18th birthday and you liked aizawa

Aizawa: was in the audience

Denki: was at the guitar

Bakugo: was at the drums

Mina: was the back up singer

others were back up dancers