What a wonderful idea: the Governor General marking the Diamond Jubilee in one of the other realms (aside from Britain, although I assume Their Excellencies will be in the UK for a luncheon of current Governors General or something similar later on in the year). It goes to show that the Crown does indeed transcend national boundaries.
The question now is this: Will the Canadian media care to highlight this aspect of His Excellency's visit? Because the Queen has chosen to stay in the United Kingdom this year, the media in this country and elsewhere has assumed that the Diamond Jubilee is a primarily British event, irrespective of her role as Queen of Australia, Barbados, Canada, and so forth. I'm not blaming HM for this phenomenon, but it seems as though it is becoming glaringly obvious that, as far as the British government, international news outlets, and quite possibly Buckingham Palace itself are concerned, Canada and the other realms are irrelevant as far as Diamond Jubilee celebrations go (the "Canadian Celebration" has so far consisted only of Diamond Jubilee Medal ceremonies, and it seems as though the upcoming royal tour is being controlled by British officials, hence the long and mysterious silence on TRH itinerary).