I had the pleasure of catching up with Holly Shaffer from the Illinois Route 66 Heritage Project yesterday.  She was super helpful with helping the project by sending information including a rundown of the events being held on Route 66 (I’ll post them ASAP).  Their website has got a ton of info on the attractions that Illinois offers, it’s an exhaustive list and definitely worth a look if you’re traveling Route 66 this year.
Check out the Illinois Route 66 Heritage Project Website