They gather at a monastery to take vows aimed at strengthening social harmony.
The Kardze man had distributed flyers calling for Tibetan freedom.
They now must give up their robes and attend government schools, officials say.
The ban covers organizations, production of media promoting study of the Tibetan language and protection of wildlife.
In Tibetan regions, the exiled spiritual leader's 80th year is observed along with Losar festivities.
Deployments are aimed at blocking protests against Beijing's rule in Tibetan areas, residents say.
Local residents chafe at security presence as area awaits arrival of nomads.
Praise, prayer, but little politics as Tibetan spiritual leader visits US capital.
The expected brief encounter draws China’s ire but raises Tibetan hopes.
Phakpa's early release is not explained, but his hometown celebrates him as a hero.