If I had to pick the most popular student group/activity, I'd have to pick from a list of my top 3 choices. They're found below:
-Greek Societies (fraternities, sororities)
-Intramural Sports (gets bigger every year)
-Sports fans (football, basketball goers)
There are clubs for everything here. There are over 300 student groups at UofL. Religious, intramural, academic, and greek groups are all over the place. There is ALWAYS free food somewhere on campus at some sort of group meeting (most groups want more members too, so the food really is free!)
Athletic events are crazy popular, especially football and basketball. The new KFC Yum! Center is nearly always packed to the brim in the student section.
There are all kinds of events. Charity runs (5K, etc.), breast cancer awareness fundraisers, movie nights, speeches by important political figures (senators, governor, etc.), and more.
There aren't as many parties here compared to other campuses, simply because UofL is a commuter school. If you're LOOKING for a party, however, there's always something going on, and 4th Street Live (the local bar scene) is always popular and very close to campus.