Ngawang Tsomo was subjected to torture and poor conditions during her seven-year sentence.
Lodroe Gyatso is believed to have shouted political slogans in front of Lhasa's Potala Palace, sources say.
The conference is a further bid by Tibetans to protect their culture.
Sources say confiscated passports have not been reissued, despite a an earlier pledge by authorities.
Sudden recall order affects hundreds who traveled to India to hear the Dalai Lama’s teachings.
It urges the European Union's member states to raise the issue of human rights violations in all its talks with China.
Inspired by the teachings of a revered religious leader, they vow to give up smoking, gambling, and alcohol.
Hundreds of families are moved from traditional grazing lands now worked by Chinese mines.
Tashi Wangchuk faces a Chinese court in what rights group Amnesty International calls a 'sham trial' on trumped-up charges.
He had spoken to an India-based Tibetan advocacy group about restrictions imposed on his family.