Today (May 20th) is a holiday in many countries around the world, like Cameroon (National Day), East Timor (Independence Day), Indonesia (National Awakening Day), and Cambodia (Day of Remembrance). It’s also Cuban Independence Day (or used to be, see below), for on this day in 1902 the Republic of Cuba declared her independence from Spain the United States, since Spain had ceded her last overseas colonies — Cuba, Puerto Rico, and the Philippines — to the US after Spain’s defeat in the Cuban-Spanish-American War of 1898. (By contrast, the US did not grant independence to the Philippines until 1946, while Puerto Rico is still a colony of the US.) Today’s Cuban Government, however, is so insecure, petty, and small-minded that it refuses to recognize “El 20 de mayo” as a national holiday. Here’s an idea … Why won’t the Cuban Government hold a national referendum on this symbolic issue and let her people decide whether they want to continue to celebrate “El 20 de mayo” as a holiday or not? On second thought, never mind … dictators don’t like to take orders from their people.
When will she be free?
prior probability 
Hopefully soon she will be free. They won’t hold the referendum because as you say they are insecure. They are afraid of what may happen if they allow the people to start voting. Cuba does not want anything to do with democracy.
CUBA LIBRE
Although I agree with most of this article, Puerto Rico is not a “colony” of the United States. That’s an insult to the great people of Puerto Rico.