You entered class, some were already there, some came right after you. The bell then rang, Aizawa woke up, and Midnight and Present Mic walked in as well.

Midnight: "Students of class 1-A. We have agreed to finally allow you to choose your hero names." Midnight stated in a calm, firm tone, then Mic continued. Present Mic: "This is an extremely important decision to make, so that's why we're here as well! So, what are you waiting for? Begin thinking!" The students nodded.