One of the largest 24-hour events in the world attracts 3,500 participants to test their endurance for the benefit of the Arizona Cancer Center from 11 a.m., Saturday, Feb. 18, through noon, Sunday, Feb. 19; free spectator. A bike fair and expo takes place from Friday, Feb. 17, through Sunday, Feb. 19. Food and beverages are available for purchase. Visit epicrides.com
for schedules and details.