Won't be any issues, Benet has had this set up for 10 years+. It has prevailed thru some heated rivalry games, Naz, Joliet Catholic, as well as a couple other games where the fans did not see eye to eye, not really had any issues. Certainly not like when playing at Hanson stadium having to be wanded on the way in.
The ESL fans I saw at WB were way more festive, polite and decorous than fans from some of the "big" programs from the Chicago land area. That is what HS sports is supposed to be about. They looked like they were having a ton of fun at no one else's expense.
However, if you want to wander around.....Benet plays at Benedictine College which is across the street from Benet. Since it is a college campus they do have your standard college benefits. At the south end of the stadium is a parking lot, at the S/E corner of that parking lot is a bar called the Coal Ben (in the old power plant, where the smokestack is). Bar opens at noon with college pricing, $2 beers, $7 pitchers and $4 hamburgers. lots of TV's for seeing early college action. Come on in its usually a pretty festive atmosphere and fans of all teams are welcome although it is humorous to see 50 year old fans carded.
its a 100 yard walk to the entrance to the stadium.