UK landmarks, including the Angel of the North and the London Eye, will be lit up with green lights to mark the annual celebration.
18 March - Comic Relief Red Nose Day
The fundraising programme is broadcast on BBC One and Two, hosted by Jonathan Ross, Davina McCall, James Cordon, Fearne Cotton and Lenny Henry, among others.
20 March - Eighth anniversary of start of Iraq War
The eighth anniversary of the start of the Iraq war, which ended on 30 April 2009.
20 March - Ryanair boss celebrates 50th birthday
Michael O'Leary, CEO of Irish budget airline Ryanair, turns 50.
21 March - Fifth anniversary of the first tweet on Twitter
Five years ago today, one of Twitter's founders Jack Dorsey (@jack) wrote the first tweet. The site went public on 15 July 2006. It is now estimated to have 190 million users who write 65 million tweets every day.
21 March - Go Compare opera singer releases debut album
Tenor Wynne Evans, the singer in the Go Compare adverts, releases his debut solo album A Song In My Heart.
23 March - Budget statement
Chancellor George Osborne delivers the first regular UK Budget statement of the Conservative-Liberal Democrat coalition Government at 12.30pm. A debate will follow with Labour Party leader Ed Miliband.