The Circus. The formal name is Ringling Bros. and Barnum & Bailey Circus - aka "The Greatest Show on Earth". The Tampa Bay area has historically been the first stop in the new tour that runs throughout North America. The Circus typically is in Tampa and St. Pete for a week to 10 days around Christmas/New Years.
Official Ringling Circus Website
Great Wikipedia Page Including List of Ringmasters
Sign up to be a Ringling Circus Facebook Fan