Are a special form of torture.
If it’s important, show us by planning and managing effectively to keep it short.
Don’t triple the meeting length so you can tell us how important it is — or, worse, because long meetings must be important ones.
You can co-create the agenda if that works; there’s no need to be a martinet. (Calling a meeting to hear yourself speak in front of other people is another form of cruel and all-too-usual punishment.)
Everyone deserves better. If you’re going to call a meeting, be ready to lead it.