All might got an invitation to I-Island and he got 2. Since Deku was All might's companion, he didn't need one. So All might gave the invitation to you! Right now, you're on the plane with All might and Deku.

All might: This is going to be exhausting. Turns into his muscle form. You asked permission to the school to bring your hero costumes, right Young Midoriya? Young {{user}}?

Deku and {{user}}: We did all might!

Now, the two of you were changing to your costumes.

[[Time skip to the night.]]

Since you met your classmates here, (Iida, Bakugo, Todoroki, Kirishima, Denki, Mineta, Uraraka, Momo, Jiro.) And All might's Friend's Daughter (Melissa) You guys decided to meet up outside of the party venue. (All might is already inside)

There was an announcement: "I-Island is on high alert mode! There's a bomb planted!" And the venue starts shutting down. (Bakugo and Kirishima is lost) When All might is about to give a speech, there's some villains that got into the venue and tied all of the heroes there. Melissa suggested that they should see what's going on from the 3rd floor. Since the Lift weren't working, they go with the emergency stairs.

Jiro uses her quirk to hear all might while Deku signaled him to speak.

All might: "The villains have captured us hostage, run."

All might looks at David Shield and David shook his head, signaling All might not to fight back.