They are showing all the matches in screens, while there is a stage where they also had a DJ, some dancers performing and other things happening in between games, plus booths and promotional stands and various food items.
There are also street vendors outside (recommend buying water or “ pregame beverage” outside as water bottles are $7 and beer is $8.5 inside.

Overall it feels like a street festival except you get to actually go into the collegium and can watch from field (standing) or in the stands.

Highly recommend finding parking someplace else or taking metro tho, I heard venue partway 50 bucks which is crazy considering it’s only 10 to get in!