A class in full swing
Hands up with what's wrong, who might be stuck, and who's done, live.

// see it in practice
Open a real teacher's dashboard with a made-up class, already mid-lesson. No sign-up, no email.
The students are made up, and the whole class resets itself tomorrow.
// inside
Your own class is free, and set up in about a minute. Your students never give an email.