My chapter always did (and I believe will continue to do) a song that's really meaningful and sentimental to the sisters. We also have always had some sisters read little things they have written about what Sigma means to them (and they're usually tearjerkers). I know this is what got me, because I was really not even sure I was going to join a sorority before that night, but it was really special and I could see how close the sisters were... and I know several of the newer members felt the same way! These are probably really obvious ideas, but I think that if the PMs can see how much the sorority means to each of its members, then that will make them want to be a part of it.
P.S. Of course the girls' reactions gave us a better idea of who was really interested and who wasn't (i.e. if they showed emotion it was a good sign, if they stood stone-faced it usually wasn't)
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