On a trip to Miami on December 2014, I searched for any races available to run. And, to my surprise, I found this little 5k neighbourhood race, where I would run dressed in Santa Claus suit. I registered online, and picked up the costume on race day.
Like most small races in USA, it's all very organized, friendly atmosphere, lots of families hanging around, people running with dogs, baby strollers, etc.
Running in a Santa costume was a new experience to me, I really liked it.
And the finisher medal is really beautiful!