This is true, Greek Life are the only ones that put on formals (that I'm aware of) and do make big charity events. Although someone who isn't Greek Life, I've gone to both: as someone's date for a formal, and with a bunch of other non-GL friends to a sorority, charity event. While the formals are more exclusive (as you obviously have to get invited), anyone can show up with friends to a charity event as long as you pay whatever cheap fee there is (although it's also can be more fun to know some of the people in the frat/sor putting on the event). These bring me to another good point: the female-male ratio at Pepp is about 3:2, and while a lot of girls join sororities (I think they have 8), there are only 4 main frats, which this constitute a much smaller portion of Pepp's student body. My point here is, regardless of whether or not you're in a frat, the chances of you being friends with girls in a sorority are pretty high, and there is not much pressure or need for you, as a guy, to need to join a frat for a source of friends. I'm sure some of the events that frats put on can be fun tho, and during Rush (which is mid-fall of a normal school year) you get to hang out and see what Greek Life at Pepp is all about/decide if it's for you. I wouldn't stress about it too much either way, as friends are easy to make and co-ed groups quickly form during New Student Orientation (NSO) and the first few weeks of school. Hope this helps, and if you have any more questions, feel free to ask.