Please excuse the forum crash, ladies!
Can you reserve classrooms for recruitment parties? You will have to work around scheduled classes and you may not be allowed to have food or drink, but it's usable space.
Are there function rooms in the dorms that you can use? Any area alums whose houses you can use?
We used to have a round of formal rush called "informal rush" (not to be confused with COB) which was the only time sisters could take PNMs out of the student center. We'd do picnics, ice cream, coffee, frisbee or volleyball in the park, etc. You might use something like this for a round if you're stuck for indoor space.
Hope you all are safe post-Ivan.