Mary Prince Day or Somer’s Day in Bermuda
Mary Prince Day or Somer’s Day in Bermuda is held on July 31. Celebrated on Friday before the first Monday in August. This event in the third decade of the month July is annual. 
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It commemorates Admiral Sir George Somers who was the founder of the English colony of Bermuda. Somers Day was observed for nearly two decades before Parliament created the two-day Cup Match holiday in 1947. From 2020, this holiday was renamed as Mary Prince Day, honouring a once enslaved Bermudian who became a hero of the abolitionist movement in Britain.
Mary Prince, an enslaved Bermudian—and, thus, a British subject—is the first known Black woman to relate a slave narrative. She was the storyteller of an abolitionist collaborative writing team that brought her story to print.
Similar holidays and events, festivals and interesting facts
Emancipation Day in Bermuda on July 30 (celebrated on Thursday before the first Monday in August);
Emancipation Day in Barbados, Bermuda, Guyana, Trinidad and Tobago, Jamaica on August 1 (Celebration of the Slavery Abolition Act 1833 which ended the slavery in the British Empire, generally celebrated as a part of Carnival, as the Caribbean Carnival takes place at this time);
International Day for the Prevention of Money Laundering on October 29
Boxing Day on December 26 (Belgium, Fiji, The Bahamas, Guyana, Trinidad and Tobago, Samoa...);
Bermuda Restaurant Weeks on January 15 (Beginning on Thursday of the second full week of January);
Bermuda Triangle Challenge Marathon Weekend on January 16 (Spend from Friday to Sunday of the second full week of January. Bermuda is the perfect place for active travelers);
Bermuda Festival of the Performing Arts on January 17 (started in 1976. January 17 to March, 2021)