Things to do Sept. 18-24: Naperville Irish Fest, West Dundee Heritage Fest, Mundelein Arts Festival and more

A packed week of fall events runs Sept. 18–24 across the Chicago area, highlighted by Riot Fest at Douglass Park in Chicago. The festival runs 11 a.m. to 10 p.m. Friday through Sunday, Sept. 18–20, with headliners including Twenty One Pilots, Iggy Pop, Rise Against and Pixies on Friday; Tool, Morrisey, Social Distortion and NAS on Saturday; and Pierce The Veil, Alanis Morissette, Elvis Costello & The Imposters and The Format on Sunday. General admission starts at $115 for one day, $230 for two days, and $340 for three. Other calendar picks include Naperville Irish Fest, multiple Oktoberfests, and Retro on Roscoe, with prices and times listed for each.