When you hire out your building, you stay the responsible person. The Home Office's guidance says to explain to each hirer what's expected of them, and to be able to show the SIA that you did.
In practice that means three things: put what you expect in your hire terms, give each hirer a short briefing for the building, and keep a note of who you briefed and when. The person in charge on the night needs to know the ways out, where to bring people in, and how to lock the doors.
A big public event of 800 or more, needing a ticket, a pass or membership to get in, is the exception. It can be a qualifying event, and a company that takes control of the hall for it becomes responsible for the event, working with your committee. That's rare for a village hall, but ask about numbers when people book.