PRIMA CAR CARE CAR SHOW When:  May 15 (Saturday) Where: 5454 Washington Street, Unit 4, Denver CO 89216,   (phone 303-330-8045). Time:  10:00 to 12 noon. Food:  coffee, donuts and other pastries. Cost:   free. Judging:  none. Host:  Patty Troxell  rcats@juno.com Summer is around the corner and Prima Car Care has invited …