Read the part in this Reddit tread about the the timing of this "annual pool party". The Solstice connection sounds promising. So, I don't know if there is any connection, but Lovettsville is known for their huge Oktoberfest festival every year around that same time of year. It shuts the town down for Friday night through Sunday and is very family friendly but known as kind of a German "feast & drunk fest". It is common for residents to throw Oktoberfest parties and after parties that weekend. The dates are not the same weekend but the next weekend I guess, but thought I'd throw that out there, just incase! In 2106 it was the weekend of Sept 24, In 2015 it was the weekend of Sept 25, and in 2014 it was the weekend of the 27th 2017 it will be held the weekend of Sept 23, but hopefully all these sick fucks will be in jail by then! Lovettsville Oktoberfest