SPRUCE MEADOWS, Calgary, AB):   The Spruce Meadows Summer Tournaments open up their world-class competition tomorrow. This year’s schedule includes five weeks: ‘National’ CSI-W 5* June 5-9, ‘Continental’ CSIO-W 5* June 13-16, ‘Canada One’ CSI-W 4* June 25-30, ‘North American’ CSI 5* July 3-7, and ‘Pan American’ CSI 5* July 11-14. With increased prize money,