Every campus has a long hallway, building or just a central place where organizations set up booths/cabinets to promote their organization and get the word out.
Here at Purdue one of those places is Stewart Center. This building has organization cabinets everywhere and they are conconstantly changing.
This long hallway is filled with information about different groups, events, and trips offered to students. This is a great way to get the word out about your organization and show off your stuff. Greek organizations do this quite often. It is an easy, cost effective way to publicize your organization with minimal effort.
Now go find that place on your campus and join an Org near you.