Dandelions and creeping Charlie: the fall window has mostly closed.
University of Illinois Extension says fall is a good time to deal with broadleaf weeds, because perennial weeds send energy down to their roots before winter. Purdue Extension puts the best window for a broadleaf herbicide at mid-September to early November, so for most Champaign-Urbana lawns the realistic plan now is to keep the lawn thick and revisit weeds in spring. Purdue also notes that complete weed eradication isn't practical and a few weeds are acceptable.
One tip: rake leaves off the lawn so you can see the weeds, and hand-dig scattered dandelions while they're still visible. If you use any lawn product, follow the label exactly.
Questions about a stubborn weed problem? Request an assessment at budstreecare.com.
Sources: University of Illinois Extension, https://extension.illinois.edu/news-releases/five-fall-tips-cool-season-lawn-care | Purdue Extension AY-9, https://ag.purdue.edu/department/hla/extension/extension-publications-library/ext-pubs/ay-9-w.html