You should be able to get off work for the days of rush. It's only five days, and two of those days are just two hours, in the evening, and it looks like they're not even mandatory. So that's
three days.
http://studentleadership.csusb.edu/G...ecruitment.htm
I mean this is a pretty easy schedule, compared to some I've seen. If you are going to have issues making these events, you might want to rethink sorority membership.