| Andersonville Arts Week. |
| 6:00p Chi Hack Night at 1871. |
| 6:30p Millennium Park Movies (Tu). |
| Patriot Day. |
| 9:00p South Park new episode on COM. |
| Programmers' Day. |
| 6:30p Race Judicata at Avery Field. |
| Disclaimer. |
| * Riot Fest at Douglas Park. |
| Fright Fest at Great America (Fr/Sa/Su). |
| Unmarried and Single Americans Week. |
| Yom Kippur. |
| 11:00a Vintage Garage. |
| 2:00p Model Rocket Launching at East Branch Forest Preserve. |
| Mexican Independence Day. |
| Stepfamily Day. |
| 6:00a * North Shore Century ride at Dawes Park. |
| 11:00a Ravenswood ArtWalk at Central Gallery. |
| Citizenship Day. |
| 10:00a Talk Like a Pirate Day. |
| 10:00p Drum&Bass night at SmartBar. |
| 7:30p Group Skate at Daley Plaza. |
| * International Day of Peace at Observances locally. |
| 8:30a "Step Out to Fight Diabetes" at Diversey Harbor. |
| 10:00a Long Grove Apple Fest at Historic Long Grove. |
| 11:00a Heart Walk at Soldier Field. |
| * Autumnal Equinox. |
| 1:30p Ghosts Of Graceland Cemetery walking tour (Su). |
| 5:30p World Carfree Day. |
| Start of Libra. |
| Sukkot. |
| National Punctuation Day. |
| 6:00p Atomic Sketch Event at Green Eye Lounge. |
| Native American Day. |
| Pumpkin Farms at Many locations. |
| 11:00a EXPO Chicago at Navy Pier. |
| 5:45p Critical Mass at Daley Plaza. |
| 6:30p * Full Moon Fire Jam near lake south of Foster. |
| 5:45p Southside Critical Mass at Nichols Park Plaza. |
| WAY too much great theater and comedy and dance to cover at Hundreds of city locations. |