Timeline of key events over past two decades

2003: Half a million people marched on July 1 against Article 23 of Hong Kong's mini-Constitution - anti-subversion legislation that the government wanted but failed to introduce.

2012: On July 29, tens of thousands rallied against officials' proposal to include topics like China's history and national identity in the Hong Kong school curriculum. By September, the government had allowed schools to choose whether they would implement this.