Village halls and community centres under Martyn's Law
A village hall or community centre is in scope where 200 or more people may reasonably be expected present at the same time. Most are below that and out of scope entirely. Those in scope are almost always standard tier.
Most are out of scope
The threshold is 200 present at the same time. A hall that seats 120 for a wedding is out of scope, and no duties apply.
That is worth establishing first, because it settles the question completely rather than leaving you managing a duty you do not have.
Judge it on the busiest realistic use
A hall used for a parish council meeting on Tuesday and a 250-person party on Saturday is judged on the Saturday. The question is what may reasonably be expected, not what is typical.
Include everyone: guests, hired staff, caterers, volunteers on the door.
Who holds the duty
The duty sits with the person who has control of the premises — usually the trustees or the management committee, not an individual hirer.
Where a hirer takes control of the premises for an event, work out in advance who is responsible for what, and write it into the hire agreement.
If you are in scope
Standard tier: notify the SIA, and have the four public protection procedures. No documentation duty, no equipment, no training requirement.
For a volunteer-run hall the honest answer is that the duties are modest and can be met without spending money.
Enter your premises and expected occupancy. You get the tier for each site and the reasoning behind it. Free, no account.