info

I transferred as a junior and didn't know much about Greek life and now I do and want to have at least a year of memories 😞

Get to know girls your age that are still in sororities
Tbh by their senior year a ridiculous amount of girls have dropped out
A freshman pledge class if 50-80 might have half that left at graduation
Some sororities might want to fill that space with an exceptional senior that really wants to contribute
More likely a chance with groups like KD and ADPi

The tone and implication of your reply post make me think you are not one of those exceptional seniors....

You said you transferred as a junior so you should have had a year to meet girls in various sororities. In class or clubs or parties or apartments or at campus hangouts....
And you imply you got to know enough about Greek life last year to determine that you want to be part of it for your last year...
So if you don't know any sorority members well enough to see if they might be doing COB events then I am going to say you are a long shot for getting a Greek experience....
If you truly met no sorority members that you know well enough to tell you are interested, then I guess sign up for COB thru Panhellenic
Otherwise you probably just waited a semester too long to figure things out

It's not just about being nice and pretty. It's about finding girls who fit within the chapter, and that's where connections help during recruitment, because they know what a girl is like and if she's a good fit in the chapter. It's even more important for COB because that's not always publicly advertised if it's just a few girls. If you're interested, reach out to the chapters directly and tell them you would be interested in COB.