This year's Barrington, Illinois Concours D'Elegance is featuring, in its motorcycle classification, British and Pre-War American motorcycles, with a special emphasis on sidecars from the early 1900s up to 1973. (Unrestored motorcycles in these categories can also enter the Preservation Class).
Details, including the application process, can be found here:
I've been involved in the Concours for a number of years and can vouch that this is a great event and that exhibitors are treated well by the Concours.
Contact me (at email@example.com) with any questions you may have.
Moderators: Feel free to move this to a more-appropriate part of the Forum or, if you wish, duplicate this in other sections.
The Prairie Chapter