The venue has a reputation for being....shit (they booked Gavin McIness on one of his little tours a while back). Each year, someone in my city puts on a metal fest there and lots of nazi bands from Europe come over and play, and apparently openly fascist shit is sold at the merch booths.
Last year I emailed the local city council about it. They were useless. Right now, I'm about to email the music section of my local big paper about it, AND OFFER RECIEPTS (since I can easily compile a good amount of evidence of nazism) to see if they wanna shed some light on it.
What else can I do short of 
?
1000%. Local businesses live off of being too small for regulators to take the time to check them on shit. You are surrounded by a sea of health code violations at any given moment