In the past we have had something similar, for the life of me at the moment I cant remember the name of the event!!!
(im getting old
LOL just kidding...23 hardly counts as old...
ANYWAY...
what we did was plan a big BBQ with our heart to heart alum chapter, and when we got there we filled out a little card with our majors, fav activities, fav candy, hobbies, fav music, etc etc. and the alums filled out a similar card, modified a little, to add things like career path, major while in school, chapter you came from, etc. etc.
WELL...our eboard and alum eboard took them all and paired alums with collegiates to form pairs of people who had similar hobbies or someone in a similar career path. For example:
my major is elementary education and my alum big sis was a teacher.
SOOOO the alums would get the name of a collegiate and stand up and say.... my lil sis is..."insert name here"
it was ALOT of fun!
Me and my alum big sis still talk, she would always come to meetings and would send me email notes all the time.
She even made me a jar of my fav candy (the ones i had put on the original list) she is AWESOME!!!
anyways that is my idea...hope it helps...
we haven't done it in a while but it was really nice...
we had a big cake and BBQ and it was like an alum collegiate get together....
email me if you want more details
LIOB