National Trails Day: Lace up the hiking boots to take advantage of the miles of new trails built by volunteers at the in-the-works Cross Bar trail center northwest of the city. Meet at 9 a.m. at the white gate to caravan inside. Horses, mountain biking, hiking and bird watching are all welcome. (9 a.m. to 3 p.m. Saturday; Brickplant Road off North Western Street; 806-236-2088)