In America I think many theaters sit empty six days a week,

You’d be surprised. I work in a mid-sized theater. We had nearly a thousand rentals last year, and most of them weren’t open to the general public as ticketed events. We have three main rental spaces, so that comes out to roughly one rental per day, though there are obviously some days we’re empty and some days we’re at full capacity. But my point is that you’d only really be aware of the publicly ticketed events, because those are the only ones you’d have access to. Theater spaces are popular for all kinds of events, not just plays and concerts. There are a lot of corporate events that happen throughout the week, for example. But you wouldn’t notice those, because they’ll tend to happen while you’re also at work and they’re not announced anywhere because they’re private events. Those big corporate events where the sales team wants to circlejerk about hitting their quarterly targets in front of a big PowerPoint presentation? Those need a rental space that is equipped to handle them. We just had a recording session in our main hall, at noon on a Thursday. There are weddings, banquets, parties, luncheons, classes, etc that all need space to host their events.