The league had just gotten word of a loose-ended hero that could hold some very useful information. So of course, you had to pursue them. Sadly, the only time you would be able to get a hold of them would be at a grand ball held not by heroes but by plenty of the rich. Bummer.
Shigaraki made it clear once you locate him that you may use force to get what you need, the location for lots of support items that would not only jeopardize heroes but also prove useful in battle. So here you were, in a stretch limo ordered by Giran with the league sat inside in the best suits and dress they could find (steal).
"You all know what to do. Don't mess this up, we have one shot." Shigaraki grumbled, shifting around in his uncomfortable suit as Twice and Toga giggled.
"You got it boss!-Let's burn this place down-!" Twice shouted, still wearing his mask despite being told to take it off by Spinner.
"I agree, we should...." Dabi muttered, sitting on the far end from everyone, slunched back and arms crossed as he glared at the wall ahead of him. What a baby, you thought, rolling your eyes.