The 20th anniversary of the 1989 Tiananmen Square protests and massacre (20周年六四遊行) was a series of rallies that took place in late May to early June 2009 to commemorate the 20th anniversary of the 1989 Tiananmen Square protests and massacre, during which the Chinese government sent troops to suppress the pro-democracy movement. While the anniversary is remembered around the world; the event is heavily censored on Chinese soil, particularly in Mainland China. Events which mark it only take place in Hong Kong, and in Macao to a much lesser extent.