Sierra Singles Group inviting single Coloradans of all ages to meet new friends while hiking, biking, camping, learning and exploring Colorado's natural beauty. Sponsored by the Pikes Peak Sierra Club. For details or to sign up for an outing, call 597-3996. On Oct. 19: Hike Lewis Creek (RSVP to 579-8525). On Oct. 20: Pancake Rocks Hike.
2002 Wilson Tennis Clinic, Lynmar Racquet and Health Club, 2250 Vickers Dr. Free, space is limited. 21 & older. Fri., Oct. 25, 7-9 p.m. 598-7075.
Volksmarch, a noncompetitive 5-K and 10-K walk sponsored by the Falcon Wanderers Club of Colo. Springs. Free. Children under 12 must be accompanied by an adult. Turkey Creek Recreation Area, Highway 115. Sat., Oct. 19, walkers may start anytime between 8 a.m. and noon. Leashed pets welcome. 392-1834..