ARCA Menards Series 2021: Race 17/20
| Race | Southern Illinois 100 |
| Date | Sunday, Sept. 5, 2021 |
| Track | DuQuoin State Fairgrounds |
| Layout | One-mile dirt track |
| Location | DuQuoin, Illinois |
| Start time | 9 p.m. ET |
| Tickets | TBD |
| TV channel | MAVTV |
| Live stream | TrackPass |
| Radio | TBD |
| Race day schedule | TBD |
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