Of course! You have to! Rush week is very very important. You can't just waltz into a fraternity and get a bid. Rush week is where you make yourself known, and its quite a bit of work. Basically, rush week is where all the fraternities hosts events for people interested to check them out. To guarantee your chances of a bid, you have to go to all of the events, and not just that, you basically have to talk to the members, A LOT. Ask questions, add them on facebook, become friends, and simply be cool. You have to be memorable. After rush week, the members get together and decide who they want in the fraternity. If they don't remember your name, you're not getting in.
I rushed and pledged another fraternity last year. The pledging process (which for most fraternities lasts a quarter) wasn't impossibly hard (but definitely far from easy) for me but that fraternity just wasn't what I was looking for so I depledged after a couple of weeks. If you get a bid, they will call you asking if you want join. Make sure its what you want before you say yes, because if you depledge a Greek fraternity, you won't get into another easily (they have a blacklist of some sort). Luckily, the fraternity I depledged wasn't Greek.
Join their Fall 2010 Rush group on Facebook for the latest updates because no one seems to be tending to the site, but hey its summer lol. http://www.facebook.com/group.php?gid=129733910381254