If you are a G Suite school, then Google Meets have probably been the newest and most used tool of 2020! However, if you are looking to have a large number of attendees where most of them are only viewers (and not participating), there is a feature I urge you to consider- Live Stream. The most commonly used example is for whole school assemblies.
Benefits of Live Stream over regular Meets:
no need to worry about microphones not being muted
no need to have distracting and/or inappropriate chat in the sidebar
viewers aren't distracted by the many other video tiles of attendees filling their screen
decreased need for bandwidth
Check out our tutorial below that walks you through setting up and sharing a Meet Live Stream: