An annual event, Paro Tsechu is held for three days in the spring season between late March and April in Rinpung Dzong to commemorate the birth anniversary of Guru Rinpoche (Padmasambhava) who brought Buddhism to Bhutan. During Paro Tshechu, mask dances are performed inside the courtyard of the dzong. The festival concludes the unfurling of the world’s biggest silk Thangka or Thongdrel.