Trongsa Tsechu is held inside Trongsa Dzong. Trongsa Tsechu is one the oldest Tsechu in Bhutan. It is believed the Tsechus in Bhutan was spread from Trongsa. Most of the Champoen or the mask dance teachers, learned in Trongsa. On the last day of the Trongsa Tsechu, giant Thongdrel or Thangkha is unfurled.