Two more nuns have died, with a third saved at the last minute by friends who intervened.
Houses, cars, and livestock are swept away, but no deaths are reported.
Authorities approve festival but deploy police, fearing possible protests against Chinese rule.
Jailed before for calling for Tibetan independence, he was imprisoned again for giving information to 'outside separatists.'
Chinese authorities meanwhile ban religious ceremonies at Larung Gar for fear they may draw large crowds.
The order so far affects only residents coming from the neighboring Tibet Autonomous Region, sources say.
Khenrab Tharchin served five years in prison for refusing to denounce the Dalai Lama when he was a monk at Dingri Shelkar Choedhe monastery.
Rinzin Dolma hanged herself because of the government-ordered destruction of the religious academy.
Chinese authorities block religious observances and a horse race to punish noncompliance with their orders, sources say.
After months with no news, family members learn he is being held at a prison in Sichuan's Ngaba prefecture.
Social media and phone calls are closely monitored, as authorities search for people who may have already sent images outside the area.
Family members were not allowed to attend the trial or hire a lawyer to present his case.