Dickens 2012:

http://www.dickens2012.org/section/exhibitions
...a master list of sorts that compiles major events, exhibitions, performances and other resources from around the world, including The Great Dickens Christmas Fair!

The Dickens Project at University of California at Santa Cruz:

http://dickens.ucsc.edu/

The Museum of London:

http://www.museumoflondon.org.uk/London-Wall/Whats-on/Exhibitions-Displays/Dickens-London/Default.htm
...information on the exhibit that will be at the Museum of London until June 10th.

Charles Dickens' London: Death, Duplicity and Opium Dens Revealed

http://www.huffingtonpost.co.uk/2011/12/08/dickens-london-death-christmas-carol-opium-oliver-twist_n_1135890.html
...an article on the exhibit; from the Huffington Post.

A Tale of One Man and his City... 

http://www.victorianamagazine.com/archives/14101
...another article on the exhibit; from Victorian Magazine

British Library - A Hankering after Ghosts: Charles Dickens and the Supernatural 

http://www.bl.uk/whatson/exhibitions/cdickens/index.html
...an exhibit on Dickens' fascination with the supernatural.
 
http://www.bl.uk/learning/tarea/secondaryfehe/dickenslectures/dickenslectureseries.html 
...an online lecture series to accompany the exhibit on Dickens' interest in supernatural phenomena.
 
http://www.bl.uk/learning/langlit/dickens/dickenshome.html
..."Dickens in Context" - resources to investigate the key themes of Dickens's novels.

University of Delaware: Dickens at 200

http://www.lib.udel.edu//ud/spec/exhibits/dickens/index.html
...a virtual version of the exhibition that will be in the University of Delaware library until June 8th.

A Virtual Exhibition: The Extraordinary Life of Charles Dickens

http://www.charlesdickensonline.com/
...a Dickens enthusiast's virtual collection of portraits, plays, manuscripts, etc.