Events linked to reducing the teaching of the Tibetan language in schools and replacing it with Mandarin:
2020-04 https://www.languagemagazine.com/2020/04/23/tibetan-language-phased-out-as-schools-switch-to-mandarin/
2010 https://en.wikipedia.org/wiki/2010_Tibetan_language_protest
Dalai Lama (达赖喇嘛)
Tibet "re-education" camps (2020)
2008 Tibetan unrest (2008年西藏骚乱)
1987-1989 Tibetan unrest (1989年拉萨骚乱)