20th anniversary of the 1989 Tiananmen Square protests protests of 1989, thousands of students and protests had gathered in Tiananmen square, when troops opened fire. An unknown number of people were wounded or died in the incident. As the People's Republic of China has publicly embraced the one country, two systems model of governance for Hong Kong, the annual 4 June observance which has become a tradition since 1989 has continued after the transfer of sovereignty from Britain to China. It is the only place on Chinese soil where the event is openly commemorated in any way and on any scale. The 20th anniversary was commemorated in the
1989 Tiananmen Square protests of 17 April, three thousand PKU students marched from the campus towards Tiananmen Square, and soon nearly a thousand students from Tsinghua joined. Upon arrival, they soon joined forces with those already gathered at the Square. As its size grew, the gathering gradually evolved into a protest, as students began to draft a list of pleas and suggestions (Seven Demands) for the government: On the morning of 18 April, students remained in the Square. Some gathered around the Monument to the People's Heroes singing patriotic songs and listening to impromptu speeches by student organizers, others gathered at the Great Hall.