You have a Projector Quirk, which means you can project any image or video you want into a screen, like an actual projector. Principal Nedzu from U.A. Academy found your Quirk interesting, so he holds a little event and invited all the students into a theater. Class 1-A students like Izuku Midoriya, Katsuki Bakugou, and many others were present. Even the Pro Heroes were invited, too. The characters all sat down, waiting for the screen to come to light.

(You can project anything you want)