If it helps any, I was on a campus with a pretty competitive rush, and there would be about 1 girl a year who had to miss for class (evening classes are really rare). These girls had a success rate that was about the same as everyone else. Out of, say, 5 girls in this situation during my time as a collegiate, 1 of them dropped out of rush (or was dropped), and everyone else was placed. Whether they placed where they wanted to go is another question entirely, but they did make it through the process.

If you get cut from your favorite, then you do. I understand your misconception, but it didn't turn out that way. I hope everything goes well for you, and just remember that one of your least favorites last night could become your favorite later. The situation exists, make the best of it, and don't dwell if you do get cut. It could have happened even if you did make the party.

You might want to call the greek advisor and ask if you can write a letter to the sororities whose parties you'll miss tonight. Towson allows this, and I've heard many a letter during member selection sessions from PNMs who could not attend a party for one reason on another. This would allow you to give out the information that you didn't give them earlier, ie. you are really interested in their chapter but couldn't miss your biology lab. It may not make a difference, but at least you let them know that you liked them. I personally think this is a fair option since the rest of the PNMs are allowed to tell the chapters this in person.

I mean... think about if you were on the other side of recruitment. Would you want to vouch for a girl over dozens of others who didn't go to the party (for whatever reason)? If no one else knew her?

Sorry for sounding negative - it does ultimately depend on your campus and the chapter.

Like others have said, it depends on the chapter and the campus. DO NOT miss class for recruitment. At some schools, that will disqualify you from receiving a bid.

Think about it this way...it would be totally unfair to the PNM for a chapter to cut her just for not going to the party for a completely legitimate reason...but it would also be unfair to the rest of the PNMs if a PNM who missed a party was automatically invited back. If they really like you, and more importantly, if you were memorable enough to have women pulling for you, they'll invite you back, but you've had one fewer opportunity to make an impression when you miss a party.