(SPRUCE MEADOWS, Calgary, AB):  There are a few sure indications of the arrival of spring: the swelling of buds on the trees, tulips poking up through the newly thawed ground, street sweepers out gathering up all the gravel that was spread on the icy, winter roads. There are a few additional signs at Spruce Meadows that usher in spring: new foals, construction and the removal of the tarps from the grass of the International Ring.