A "Day of Discovery" takes place from 7:30 a.m. to 3 p.m., Saturday, Jan. 5. The free event includes nature journaling, nature tables, information tables and the following events: At 7:30 a.m., a multi-sport event with a 5k run, 13-mile bike ride and 2-mile run. Register at taggrun.com. At 10 a.m. and 12:30 p.m.: free guided hikes on the Arizona Trail. At 11 a.m. and 2 p.m.: an easy-to-moderate guided archaeology trail walk. Visit colossalcave.com
for more info.