Spring rush is very much like fall rush but the pledge classes are not as large. There will be three or four days officially set aside by the Interfraternity Council and all the fraternities will host open houses on those nights. It's an informal process: you visit as many houses as you like and when you find a fraternity that is mutually compatible they'll ask you to join. You'll be initiated before the end of the spring term. The rules are very relaxed; you can pledge a fraternity any time. My fraternity will take a class of perhaps 15-25 men in the spring and I think that's probably on par with the other big chapters. Let me know if I can help with any more information.