Hi Vonnie
Welcome to the forum, it sounds like something that would that would have happened in those days. Circus parades were a regular and looked forward to event.
I'm afraid though I have no knowledge of the event you describe. I don't think that in 1921 that my father had even been born let alone myself. Your mother sounds a grand old lady, you should be encouraging her to tell more tales of those days and then relate them to us on here.
Phil