fraternity informal

There is a lot about sorority informal here, but what about a fraternity informal? What fraternities are doing informal/spring this year. And personally what fraternities do guys like the most and which ones do you dislike?And why? I already have a few I'm interested in, them being PhiDelts, PiKapps, and Theta Chi. Just want to know how you guys think. and also so others can get an idea of what's going on and what to look forward to.