What KSUviolet said. If only 10% of the people you meet during a semester end up joining your sorority, for example, then you're better off if you meet 100 people rather than 20.
10% of 100 > 10% of 20
My first suggestion would be to build a names list. Have everyone in your chapter write down the names of every non-Greek woman they know on campus. Build an Excel spreadsheet and add new names every time you meet someone new.
Then hang out with them. Invite them to lunch, to grab coffee, to study, to watch tv.. whatever. A good rule is that for every potential member you're hanging out with, only invite that many sisters + 1. So if you invite 2 potential members to lunch, make sure there are no more than 3 sisters there with them.
Don't rely solely on tabling. Keep in mind that you're trying to make friends. And you can't make friends with new people if all you're doing is sitting at a table with your current friends.
Meet as many people as possible!
Hope this helps
