This happened at a show where I live too- or at least I was told it did, I didn't go to the show. From what I heard, police saw the event page on Facebook for a house show at a place that would throw them pretty regularly and went the day of the show and shut it down. They don't do shows there anymore. This is after they went one by one to all the actual all ages venues in the entire city and shut them down- forcing us to do house shows. Shit is getting ridiculous.
I run shows at a house venue, and we've been fortunate enough to rarely have trouble with cops (they've come by once or twice and are usually just making sure underage kids aren't drinking). Hopefully, if we deal with any cops trying to break up our shows beforehand, they'll be as dopey as this haha. It's tricky flyering and promoting a show that you can't really staple a location address on.