As a caber is about fifteen feet long, it would really screw up your turning radius.
The Highland Gathering and Games every Labor Day weekend was up at the Sonoma County Fairgrounds in Santa Rosa for decades; it moved to the Alameda County Fairgrounds in Pleasanton maybe 15-20 years ago. If I were going to look for Scottish-esque bike accoutrements, I'd start there; the times I've attended, there was booth after booth of Scottish kitsch of all kinds.
Bike-sympathetic breeks, maybe?
Peter "saw world record-holding shotputter Brian Oldfield there in the late 70s, tossing stones and cabers; he was a BEAST" Adler
Berkeley, CA/USA