Two things I wish zoom hosts would do are:
(1) Turn OFF audio 'notifications' when a person joins the session - hearing the 'doorbell' over the speaker is distracting and often drowns out what the speaker is saying.
(2) Turn off pop-up chat message notifications. Typing in the chat box in a meeting is bad enough *see my earlier common about meetings within meetings) - but seeing the messages popping up is as bad as shouting across a room.
I must admit, though, this tends not to happen in folkie sessions but more of an occurrence at political party meetings.
Oh and a third one; disable screen share, but temporarily enable it when requested by a singer or speaker. This happened at a meeting (not folk or music) where a disruptive participant kept sharing screens while a councillor was trying to provide an update. In a folk club this would be like someone with a loud or amplified instrument deliberately launching into a tune drowning out a quieter unaccompanied singer.
These examples show the need for two people to run any sort of zoom session, the chair/MC and the host/bouncer.