A Classroom’s Worth - A bunch of people or things that all ended up in the same pl

A bunch of people or things that all ended up in the same place and started causing trouble

The classroom’s worth of kids all showed up and turned the library into a wrestling ring.

There was a classroom’s worth of people in the hallway and it turned into a full-blown screaming match.

We had a classroom’s worth of people who all showed up for the same test and it turned into a full-blown panic.