You have to inform VO instantly about your change of marital status and need to submit updated forms to them.
http://www.canadavisa.com/immigration-family-status-change.html
"If a marriage takes place after the application has been submitted, but before the Canada Immigration Visa has been issued, the new spouse must be included in the application and will have to undergo a medical examination and submit appropriate documents, including application forms, marriage certificate, police clearances and the applicable government fees.
Depending on the stage of the application at the time of the marriage, delays may vary from minimal to approximately 5 months. Such delays are caused by the necessary completion of medical examinations and security clearance."
So, when are you planned to get married and will the forum members be invited? ;D ;D