The largest and most colorful festivals take place at Bhutan's dzongs and monasteries once a year, especially in honor of Guru Rimpoche. They are normally celebrated in spring and autumn. Tsechus consist of up to five days of spectacular pageantry, masked dances and religious allegorical plays that have remained unchanged for centuries. Besides being a vital living festival and an important medium of Buddhist teaching, tsechus are huge social gatherings. Bhutanese revel and exult together, dressed in their finest clothes and jewelry, in a welcoming ambiance where humor and devotion go hand in hand. For guests, the tsechu provides an ideal opportunity to appreciate the essence of the Bhutanese character.