Hosay (originally from Husayn) is a Muslim Indo-Caribbean commemoration that is popularly observed in Trinidad and Tobago, Jamaica and other Caribbean countries.

"[7] The Hosay or Husay (derived from Husayn or Hussein)[8] commemoration is a Caribbean manifestation of the Shia Muslim Remembrance of Muharram in Trinidad and Tobago[1] and Jamaica.

[11][12] In the 1850s, very elaborately decorated models of mosques made of paper and tinsel called tadjahs were carried through the streets to the accompaniment of constant drumming.

[13] The celebrations encouraged social interactions and were a rare opportunity to cross color lines where those of Indian origin could mingle with those of African, Amerindian, Chinese or other backgrounds.

Thousands of workers, who had spent the year building their tadjahs joined a Hindu named Sookhoo, in petitioning the government to allow the festival per their agreement with the Governor, who was visiting London during this episode.

In PORT-of-Spain (St. James) the police did not interfere, but in Mon Repos, San Fernando, on Thursday, October 30, 1884, buckshot was fired into the crowds of women, children and men.

That day is commonly referred to in Trinidad history as the Muhammad Massacre by Indians and as the Hosay Riots in British and colonial records.