Quick update:
I have gotten verification there is zero, ABSOLUTELY, 100% Zero, space I can grab this saturday, which was kind of as expected. Now, there's spaces that aren't directly used by this event in the dorms, where I do *not* live, but can access. But, I don't believe I'm explicitly allowed to use them for this kind of purpose, either; so, Friday is easily done, but saturday would be a chance-based game of space-grabbing shenanigans that could result in being kicked out of places and BAD END (but not really bad, since you can't explicitly determine who decided to gather at any location for a given purpose.)
What do you all care to try?