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:

Behind the Scenes Minis: Carry-on Bags
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Gustave Flaubert and the ‘Madame Bovary’ Trial
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Elizabeth Bisland, Beyond the Trip Around the World
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