The Paro Tsechu (Festival) is the largest in Bhutan. Held annually over 4 days in the Spring period (2016 dates are 20 to 24 March, but it is frequently in April) it is certainly one of the most colourful. The first day's celebrations are held within Paro Dzong, before the action moves outside with 3 further days of cham (ritual religious dancing), culminating on the final morning with the unfurling at dawn of the huge 18m square silk thangka - so large that it covers the entire face of the building - depicting the 8 manifestations of Guru Rinpoche, the founder of tantric buddhism. This sacred scroll is known as a thongdroel which in Bhutanese means that it 'confers liberation by the mere sight of it'. This is a time for Bhutanese to celebrate with their relatives and friends.