April 9, 1917. The Battle of Vimy Ridge. April 9, 2010: Day of commemoration at the National War Memorial, Ottawa.
Historica-Dominion Institute, initiators of the Day of Commemoration, has related material.
The Vimy Foundation wants Canadians to wear a Vimy Pin, called "April's poppy." The poppy does not suffice?
Ancestry.ca is temporarily offering open (i.e. free) access to its searchable database of World War One names, Canadian Soldiers of the First World War. [Disclosure: I did a bit of work for Ancestry.ca this year, and currently enjoy access to its collections.]
