Lobsang Jinpa had been charged with writing the lyrics to a song honoring a former Tibetan religious leader.
Officials reverse an earlier order allowing the gathering to go ahead, citing concerns over crowds.
Detentions come amid heightened security and sureveillance during ruling Communist Party congress in Beijing.
Chinese authorities have destroyed more than 4,700 homes and forced about 4,800 residents to leave the complex.
Local residents are also warned not to discuss politics or share news or photos with outside contacts.
Chinese officials force the move, citing concerns for the environment, a local source says.
But Chinese travelers and trade goods cross without delays, a local source says.
In a practice previously ignored by police, they had brought small quantities back to sell to friends in need.
They had been moved before from traditional grazing areas, and now must move again to make way for tourist development.
Chat group organizers must guard against discussions that threaten China's 'interests,' authorities say.
Tibetan drivers will now be checked for proper documents as China prepares for top-level Party meetings in faraway Beijing.
The event follows other religious gatherings held without interference by authorities in recent years.
'Consequences' are threatened for anyone caught viewing or sharing politically sensitive material ahead of an important Party Congress.
No one may enter Tibet during top-level Party meetings scheduled next month in Beijing.
The move restricts travel by the Tibetan minority group despite official guarantees against discrimination.
Chinese soldiers and civilian officials ask locals' help to extend road farther into Nepal.
Chinese authorities order them to leave without explanation, threatening fines and jail for failing to comply.
Villagers enjoying an outing 'on their own land' are searched and attacked without explanation, sources say.
Kardze prefecture authorities have appointed six ruling Chinese Communist Party members to supervise the study center's affairs.
Atruk Lopo had also called for the release of his uncle, prominent political prisoner Ronggye Adrak.
Around 2,000 monks and nuns are to be expelled from the complex by year’s end.
Gomar Choephel had been convicted on charges related to ‘subverting the state.’
Temblor shakes tourists in the popular Jiuzhaigou nature reserve in the quake-prone largely Tibetan region of Ngaba
Jampa Choegyal was held for two days on suspicion of contacting his relative in Australia.
Lobsang Kalsang had set himself ablaze in a Ngaba protest calling for freedom from rule by China.
The protest by a Tibetan man in Dharamsala follows a burning by a college student in Varanasi earlier in July.
The 22-day festival of rituals and dances draws participants from across all regions of Tibet.
He is taken into custody without explanation after being called to police headquarters in Dartsedo.
His remains are being taken to Dharamsala, where they will be cremated in a ceremony on July 26, sources say.
The annual event reflects growing identification with traditional Tibetan identity, sources say.