[IndianaSigKap]

Leslie Anne part of the differences in our experience might be semantics, too. :-) We didn't call anything mixers. We had date parties, parties, and socials. Socials were strictly just our chapter and one fraternity, but they still opened at midnight, when we bothered to have them. Not a lot of chapters had socials because it was seen as kind of snobby/elitist. The sororities who insisted on them were often the butt of jokes of the fraternities. Parties were paired events (or 4 ways or 6 ways) with guest lists. We usually had one or two official ones a month. Fraternities had open parties every weekend with guest lists. Even when you were paired with a certain fraternity for an event, it wasn't uncommon to go to other fraternities one night during the weekend.

Some campuses are very different, so yes the OP should check it out! But I did want to point out there are campuses out there that don't mind guests as long as they are friends with one group or the other.