Group games are always a good idea. And if you need to break everyone down into smaller groups, make sure the groups are diverse. Example: maybe you could have one brother, one of your PNMs, and two sisters on each team.
Another good idea for the future (if your campus has them) is to put on an etiquette dinner. At my school, the students who worked in catering would put them on and it was interesting, entertaining, and we had a great meal.
And maybe after the meal the active brothers and sisters could talk about Greek life. Each person could talk about their reason for joining, things they found out after they joined that they didn't expect, and their favorite memory? And the PNMs could all say something about why they're there, and maybe ask one question each?
Hope that helps!
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