Lusophone Culture Day or World Portuguese Language Day
Lusophone Culture Day or World Portuguese Language Day is held on May 5. Community of Portuguese Language Countries. This event in the first decade of the month May is annual. 
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Only 5% of Portuguese speakers live in Portugal. Unsurprisingly, with populous countries such as Brazil and Mozambique having it as their official language, the majority of Portuguese speakers are not from Portugal. However, the estimated proportions of Portuguese speakers outside of Portugal are quite astounding—only one-twentieth of the world’s Lusophones actually reside in the language’s home country.
Similar holidays and events, festivals and interesting facts
Mother's Day in Hong Kong on May 4 (also Hungary, Lithuania, Mozambique, Portugal, Spain, Romania; celebrated on the first Sunday in May);
Catholic pilgrimage to Our Lady of Fatima in Portugal on May 13
European Siblings' Day on May 31
Iberianism Day on June 7 (unofficial holiday);
Start of fairs in Lisbon, Portugal on June 13
World Anti-Bullfighting Day on June 25
Madeira Day on July 1 (Madeira, Portugal)