Tourism Calgary has launched a new regional and national marketing campaign just as the “Greatest Outdoor Show on Earth” — the Calgary Stampede — gets underway. The three week marketing initiative will let travellers know that Calgary’s attractions, restaurants, hotels and festivals are ready to host the world this summer. In fact, you can check out the Calgary’s Doors are Open video by going to http://www.visitcalgary.com/calgary-doors-are-open Seen here is Calgary mayor, Naheed Nenshi surrounded by Calgary’s tourism industry officially opening Calgary’s doors to the world.