Ratcatcher's Day is celebrated on the 22nd of July in the USA and Australia. 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