Masquerade Carnival in Costa Rica
Masquerade Carnival in Costa Rica is held on October 31. This event in the third decade of the month October is annual. 
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Masquerade Day or La Mascarada is a Costa Rican adaptation of Halloween, which is celebrated on October 31st. The colorful parade of giant masks is an authentic local tradition that dates back to the pre-Colombian customs, Carnival, and shows of giants during the times of Spanish colonization. The first masquerade was held in Cartago in 1824. After more than 100 years, in 1996, it was decided to revive the tradition. October 31 was officially declared the Dia de la Mascarada Tradicional Costarricense. Besides, downtown Cartago, you can watch large masquerade parades in the towns of Escazu (Escazu Central Park), Aserri (Aserri Park), and Barva de Heredia (downtown).
Similar holidays and events, festivals and interesting facts
World Thrombosis Day on October 13
Costa Rica Teacher's Day on November 22
Military Abolition Day in Costa Rica on December 1
Doce uvas on December 31 (the Spanish New Year's tradition of eating twelve grape varieties, one for each of the twelve clock strokes by midnight, subsequently spread in such Spanish-speaking countries as Mexico, Bolivia, Venezuela, Ecuador, El Salvador, Peru, Colombia, Puerto Rico, Nicaragua, Costa Rica et al);
Battle of Santa Rosa Day in Costa Rica on March 20
Broadcaster's Day in Costa Rica on March 24
National Sports Day in Costa Rica on March 30 (Held on the last Sunday of March)