I'm always curious to see how other Sigma Alpha chapters make those times special for MCs, sisters, and alumni (if there are any)

Sharing might provide other chapters with ideas they might not have thought of, if they are looking to mix things up. Some times it is nice to try something new... ya know.
I am a bit embarrassed to ask but... what are the paddles all about? I mean I know what they are but not really. I have only seen social sororities/fraternities members with them. It is not something we do... but we arent part of our school's panhellenic association, if that has something to do with it.
Thanks for the input!!