It is "a historic event"
They celebrated on May 5th.
The 5th Of May
children's day
Mothers Day on May 19th, and Cinco De Mayo on May 5th.
"Oyster Day" is celebrated on May 5th each year.
The Historic Monaco Grand Prix. This is a collection of events for vintage racing cars.
There are two Europe Days. The first is May 5th (celebrated for the Council of Europe) while the second is May 9th (celebrated for the European Union).
April 1st-may 5th
A noteworthy event today May 5th in history was the Battle of Tupelo in 1863.
An event that happened in history on the 5th of May occurred in 1762 when Russia and Prussia signed a peace treaty.
Cinco de Mayo is Spanish for the 5th of May, and that is when it is celebrated.
Most properly, there is no essential difference between "historic" and "historical", as both may be defined as "of or relating to the past". In actual usage, however, "historic" typically denotes an event of great importance, while "historical" denotes something that has simply taken place in the past.