[Entchen]

I realize in national houses this won't fly, but to reveal to new pledges who their big sisters are, we have a pong tournament (and before you ask, no, we do NOT make our pledges drink. Lots of people - both sisters and new members - play with water). Big sisters tell the New Member Ed officers a costume that their little should wear, and then, when they get to the house, they have to find the person wearing the matching costume. Pairs have been things like magician/rabbit, characters from a movie, superheroes, cowgirls, pirates, cartoon characters, etc. You could do something like that with the costumes and just skip the pong part.