:) he is not going to travel Middle east that where there people are not allowed get marry on visit visa , if incase they consider it fraud as you said but they always have right to appeal against which they cant refuse because girl is canadian and she has birth right to be with husband ,
If you get married earlier than 61 day since your arrival into Canada it could be considered as a fraud because VISITOR visa is not supposed to be used for getting married.
For some reason 60 days are accepted by immigration authorities as a period enough adn allowed for changing your mind as a visitor and for making a decision to get married...