Car teams compete in a driving tour, scoring points by solving clues, completing challenges and demonstrating Tucson trivia knowledge. The event begins at 9 a.m., Saturday, April 30, at Corpus Christi Catholic Church (300 N. Tanque Verde Loop Road), and ends at noon with an awards ceremony, silent auction and lunch at Oro Valley Country Club (300 West Greenock Drive). $500 registration can be raised through pledges or a gift to St. Elizabeth's Health Center. Call 670-0809, or e-mail [email protected] for more information.