I think inviting alum is dependent on the school. I remember another sister and myself asking about Gamma Rho's BDB and asking if Alum's were invited and we were told in no uncertain terms by the Alum president that it is for collegians only. We personally thought it was kind of lame.
I look at the fact that A) the alums who would go would probably be the ones in the alum association, so hey it encourages collegians to join the associations when they graduate. And B) HELLO every WOMAN LOVES to get dressed up and be PRETTY!!!!! Now that I'm an alum I don't have an excuse to go get a pretty dress and get my hair and nails done. I want that. LOL.
Just my opinion about what we were told.
Brianna