Families are invited to enjoy the nightlife of nature on a fun excursion to Sand Canyon this Saturday, Aug. 17, from 8 to 9:30 p.m. Preregistration is required, as space is limited. Contact the San Juan Mountains Association at 970-385-1256 or gabi@sjma.org for more information. The program is sponsored by SJMA and Canyons of the Ancients National Monument.