rushing Sigma Tau, need advice on increasing my chances for getting bid

[IGetMoney26]

Ok so Im in the process of rushing the Sigma Tau frat, and trying to get a bid. I am trying to find ways to increase my chance of getting a bid. I attended 2 events, a "graffiti party" and a toga party, and everyone seems to like me so far. The bid day is sometime this weekend I think. I have a few questions tho.

First of all, how do they determine who gets a bid? I heard the brothers of the frat vote on each person.

Also, I am attending another party tomorrow night. I had an idea to ask if I could say something to everyone, and then tell them about how I've had some great times with them already, how I am definately gonna join if i get a bid, and how I would love to have their votes. Would this be a good idea? like would it show them I am really commited and interested, or would it make me look desperate?

thanks ppl