With having the Informal Recruitment (aka Continuous Open Recruitment) each house will have events at their houses at various times throughout the few weeks following the start of school. They range from various themes to activities. They will typically last 45 minutes to an hour depending on what activities are done and the theme for the event.
I would suggest going ahead and checking out the National/International as well as local sites for each sorority that exist:
Alpha Chi Omega:
http://www.alphachiomega.org and
http://www.alphachiomega-wcu.com/
Alpha Gamma Delta:
http://www.alphagammadelta.org
Alpha Xi Delta:
http://www.alphaxidelta.org
Delta Zeta:
http://www.deltazeta.org
Phi Mu:
http://wcuphimu.4t.com/ and
http://www.phimu.org
Good Luck with doing fall recruitment! It is a lot of fun and I'm sure you will find a perfect match somewhere at WCU