How to find last-minute letters of rec?

[bbbruin]

Hi! I recently decided to rush this fall at UCLA. Because I decided to go through recruitment at the last minute, I don't have any letters of recommendation! I'm from an area where Greek life isn't at all prevalent, so I haven't been able to find anyone from my family/school/etc. who was a member of a sorority. Is it even possible for me to get letters of rec this late, and where would I find them? Is it appropriate to ask members of alumnae associations online even if I don't know any of them?

Thank you! I'm new to all of this and really appreciate your help.