Monks and nuns from Qinghai, Gansu, and Yunnan provinces are told to leave the huge religious study complex.
He is freed without explanation after serving more than four years for criticizing Beijing's rule in Tibetan areas.
Usually held only by monks, the event draws hundreds of nuns from seven convents in Sichuan and Qinghai.
A resolution of the dispute over Tibet's status has been hindered by separate security concerns, a Tibetan scholar says.
Both monks and laypeople take part in religious instruction and promotion of Tibetan language and culture.
He had watched a program in the prison's TV room outside permitted hours, a local source says.
He joins another Socktsang monk in custody after being seized at gunpoint in his quarters.
Sentenced for having supported a self-immolation protest, he is freed for 'good conduct' while in custody.
Described as involved only in the monastery's work, he may have been targeted for viewing news broadcast from outside areas.
He is warmly greeted at home by relatives and friends despite police warnings that no welcome should be given.
Lobsang Kelsang's family still lack information on his condition, though, and are not allowed to visit him.
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.
Security forces are deployed at the work site and in neighboring counties to suppress potential protests.
Chinese authorities ordered her not to discuss the death or send information to contacts outside the area.
He had spoken out while under supervision after completing a lengthy term in prison.
Nyima Lhamo had knowledge of the circumstances surrounding Tenzin Delek Rinpoche's July 2015 death in prison.
He and others had celebrated the exiled spiritual leader's birthday in online conversations.
He had been jailed for two and a half years for supporting a self-immolation protest against Chinese rule.
Detained by police last November, he is found 'languishing' in a prison in Sichuan, a local source says.