As noted by Ian Watson, Fifty years ago today, this great symbol was first unveiled and made official. Happy anniversary to the Maple Leaf.
A fiftieth anniversary seems a fitting time to look at Canada in the Whoniverse once more.
Noted commentator Derek lives in and blogs about the Mysteries Of Montreal, in a level of detail that you could set a game there (quite possibly a Call of Cthulhu game) as well as dropping in briefly. (Edit: a new post on the flag!)
Born and raised Canadian Siskoid has commented at length about representation of Canada in various settings, like national superheroes and teams.
Thoughts on a good moment in Canadian history for the TARDIS to visit?