Need A Cover Story.

So I went to a Frat party about a week ago and I don't remember leaving the party and woke up in the hospital that morning. I had a meeting with my school and they question everything. I stupidly said that it was a Frat party. I have another meeting with them soon where they are going to ask follow up questions. What can I say that can get the Frat out of the picture so they don't get in trouble. A couple brothers came and talked to me and I had to lie because I didnt want them to know what I told them already. So what can I possibly say that would put more of the blame on me and none on them?