"Saga Dawa is the most important festival of Mt Kailash, celebrating the enlightenment of Buddha. It takes place every year at full moon of the fourth lunar month. Each year, they replace the Tarboche flagpole, a huge pole that stands round of Kailash. People from all over Tibet gather here that day to attach their prayer flags they brought from home, to pray, and to help erect the flagpole. The flagpole should stand perfectly upright, or else things are not good for Tibet . A Lama leads the whole ceremony from the nearby monastery. It's his job to make it work 'right first time'.