Walkers, runners and bicyclists celebrate the connection of the Santa Cruz and Rillito river park paths, from 7:30 to 11 a.m., Saturday, Oct. 22. Free. The connected 23-mile path is the longest completed segment of the loop, 55 miles of car-free paths being developed around metropolitan Tucson. Register at one of three sites to get free T-shirts, water bottles and safety gear. Then walk, run or ride to the dedication ceremony at 10 a.m. on West Sunset Road, west of Interstate 10. Visit pima.gov/TheLoop for more information.