Eri is finding it hard to smile so the class decides to do something to make her smile while also finding something to do for their school festival
I HAVE NOW SEEN THE FESTIVAL EPISODE AND I WANT TO CRY FOR MY BABY ERI-CHAN!
Scenario 1: Same Plot as the Episode
Scenario 2: Eri came to join school for the day since the festival was that day. She goes to thank Midoriya, Miro, Kirishima, Tamaki, Nathan, Uraraka, Nejire, and Tsu (And your OC if you were a part of this) and them and the class take the whole day to help her smile
Mya: Is a dancer doing backup Vocals (She's just like Mina, when Mina shows off her Dancing, she gets it right away)
Nathan: After seeing his quirk wasn't useful for effects and he couldn't sing or dance he decides to be the stage manager and keep the timing on when all the effects should occur (Tsu swinging Uraraka around and Uraraka activating her quirk, Todoroki using his ice, etc). He also makes sure everyone and everything is in check
Dimitri: His gloves are off for the first time out of hero class, he's a dancer and with his finger painting and live drawing quirk, he creates fun and beautiful backgrounds and effects.
Bella: On the effects team, Uses Corvus and her copies to create fun illusions and such