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Cooper, who goes by DJ Foreigner, asked the owner if he could use the space to host a party called “Junkyard Jouvert,” inspired by J’ouvert, a high-energy street party that originated in Trinidad and Tobago where participants throw paint and powder at one another.

J’ouvert is also the ritualistic opening of Carnival.

The idea for River came on the same day that the artist received the news of the commission - when he was collecting mud that is used in the rituals of J'Ouvert, the opening day of Trinidad Carnival.

A separate street party known as J’Ouvert, commemorating freedom from slavery, began in the early morning hours.

The move was announced during a security briefing focused on J’ouvert, an annual Caribbean festival marking the end of slavery that brings thousands of revelers and a heavy police presence to the streets of Brooklyn.