The London Frost Fairs, were festivals held out on the ice when the River Thames froze over. Most of these fairs were in January or February, and the last of them took place in 1814.
Research:

Percy Fawcett, Manuscript 512, and a Lost City in the Amazon, Pt. 1
34:05

SYMHC Classics: Swill Milk
39:22

Behind the Scenes Minis: Mary, Beulah, Baby Alive
33:26