can you explain this day in Haiti today..something about celebrating the workers and all the children plant trees or something like that?

It's Labor Day (the international version)
It's called Fète du Travail, or Journée International du Travail.

In Creole, it's called
Jounen Entènasyonal travay
or
Jounen Entènasyonal Lit Travayè

It commemorates the struggle and social contributions of the working class. It's celebrated internationally.

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