Information via McHenry Life
"A multi-day festival filled with fun for all ages. Most events are held at Petersen Park...After the last band on Sunday, we’ll light up the sky with an incredible fireworks display. There is no charge to park or at the gate. Limited parking available, so come early!"
The festival runs July 11-21 and fireworks will be held at 9:30 p.m. at Peterson Park.
The full schedule of events for Fiesta Days can be found here.