The room
Measure a room in Will my guests fit? and save it, then come back and find out what it survives.
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The evening is never the evening you planned. Ten late acceptances, a band where you were promised a DJ, a second bar decided a week out because somebody worked out the queue.
None of that is a surprise to anyone who has run an event, and all of it arrives after the room is booked. So the useful question is not what the room holds — it is how much it tolerates.
Measure a room in Will my guests fit? and save it, then come back and find out what it survives.