Please note that the content of this book primarily consists of articles available from Wikipedia or other free sources online. The 2010 Hong Kong by-election is an election held on 16 May 2010 in Hong Kong, triggered by the resignation of five pan-democrat Legislative Councillors in January of the same year. Discussions among the pan-democrats commenced in July 2009 for five legislators to resign to force a territory-wide by-election. The plan, which they dubbed the Five Constituencies Referendum, involved one pan-democratic legislator resigning from each of the five geographical constituencies, thereby triggering a by-election in which all Hong Kong citizens could participate.