Nothing class 1 related that I know of. I believe the Huckleberry Railroad in Flint, MI does a railfan weekend each year (already happened this year I think).
If you're interested in historical equipment, you can see and ride behind steam locomotives at Greenfield Village in Dearborn. We have three operable steam locomotives, a roundhouse you can tour as well as a lot of other historical buildings. Obviously that's an everyday museum vs. the festivals you mentioned, but it might be an option for you.