That post of mine that JAM is referring to, is really aimed at smaller chapters. That doesn't seem to be the case with your chapter... but I hope it helps anyway (and thanks JAM)
For our round 1, we used to have 10-minute "tours" and then an open house where women could visit any sorority's rush rooms and stay as long as they wanted. So, tours were about impressing women enough that they came back during open houses. Peppy, energetic door chants and skits were very effective. Slide shows and videos - not so much.
Tours were themed - are you allowed to use a theme? A cute, original theme will be remembered; I still remember Alpha Phi's "Phi-esta" and I rushed 10 years ago!
Try asking different questions from the standard "where are you from" "what's your major" etc. You say it's the only night where you are allowed to ask things like that, which means
every chapter will be doing it. If you don't, that will stick in the PNM's minds - Phi Mu was interested in
me, not my major or hometown. I like JAM's idea of finding a "different" way to get at that info.
Good luck