Ratcatcher's Day
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Ratcatcher's Day is celebrated on the 22nd of July in the USA, Australia and Tasmania. It seems to be a holiday in English-speaking countries, based upon the date of the Pied Piper incident as reported in the Poem by Robert Browning.
Ratcatcher's Day is a holiday remembering Exterminators, similar to Secretary's Day
More about the historical incident at: The Pied Piper of Hamelin