When was the peaceful liberation of Tibet?

After the liberation of Southwest China, China People's Liberation Army began to prepare to March into Tibet. Considering the specific situation in Tibet, the Central People's Government has repeatedly informed the local government of Tibet to send representatives to Beijing to discuss the peaceful liberation of Tibet. Due to the obstruction of upper-level reactionaries and imperialist forces in Tibet, the former local government in Tibet delayed sending representatives and deployed the main force of the Tibetan army in Qamdo. 1950 10, the China People's Liberation Army annihilated the main force of the Tibetan army, liberated Qamdo and opened the door to Tibet.

1951April, the local government of Tibet sent a peace talks delegation headed by Ngapoi Ngawangjigme to Beijing to negotiate with the delegation headed by Li appointed by the Central People's Government on the peaceful liberation of Tibet. On May 23rd, the Agreement on Measures for the Peaceful Liberation of Tibet was signed in Beijing, and the People's Liberation Army entered Lhasa.

Extended data:

1959, 10 In March, the Tibetan local government and upper-level reactionary groups tore up the "17-Article Agreement" for the peaceful liberation of Tibet and launched an armed rebellion. On March 20, the PLA troops stationed in Tibet were ordered to carry out counter-insurgency operations. 22, The Central Committee of the Communist Party of China (CCCPC) issued instructions, democratic reform in quelling the rebellion. On the 28th, the State Council issued an order to dissolve the local government in Tibet, and preparatory committee for the tibet autonomous region exercised the functions and powers of the local government. By the end of 1960, the democratic reform in Tibet was basically completed, the feudal serf system of integrating politics and religion was completely destroyed, and millions of serfs were liberated.

References:

China Production Party News Network-Tibet's peaceful liberation