Tshechu is a Dzongkha word for religious festivals held in each locality or Dzongkhags of Bhutan on the tenth day of a month of the Bhutanese calendar.
History has it that Guru Rinpoche, the great scholar, visited Tibet and Bhutan in the 8th century and 9th century. He visited Bhutan to help the dying king Sindhu Raja in Bumthang. Guru performed a series of such dances to restore the health of the king. The grateful king helped spread Buddhism in Bhutan. Guru organised the first tshechu in Bumthang, where the eight manifestations of Guru were presented through eight forms of dances.
Here are some of events from Kingdom of Bhutan listed below but if you want to check all tentative dates for Bhutan Festivals and Events 2018 visit this Link