This is why we advise PNMs to stick out at least until after Pref round. There is no guarantee that informal will work out, or that the chapters a PNM is interested will even be participating (if they hit total, they may not be).
Your Greek Life Office probably has the best info about informal. Best of luck to you!
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"Remember that apathy has no place in our Sorority." - Kelly Jo Karnes, Pi