It was at the same bar that we went in Hoffman Estates, Hideaway Brew Garden & Bar.
It’s a 3 days events from 9/6 Fri through 9/8 Sun. The admission is free and you can enjoy authentic German food from Olde Salem Cafe and German beers from HB. It’s, of course, a dog friendly event.
We got there around 8:30PM on Friday night and I could see everybody were so happy and the traditional live German music were playing in the tent.
Seems like they have some contests going on on Saturday & Sunday. Schedule is shown in their website: https://www.hoffmanestates.org/government/boards-commissions-standing-committees/volunteer-boards-and-commissions/platzkonzert-commission