Eh? Which country do you mean, different countries have different dates. New Zealand for example has Labour Day which was enacted considerably prior to May Day memorials in other countries.
But for the US, 1891.
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An anniversaryanniversary: the annual celebration of an event on that day of a previous year
Annual
Yes
one. annual means once a year.
Annual is a year: e.g Annual salary. So roughly 365 days.