CALENDARFRIDAYAir Force Falcons hockey vs. Denver - 7:05 p.m. Clune Arena, Air Force Academy, go online for tickets: goairforcefalcons.com.SATURDAYFirst-person portrayal of a Civil War soldier - 11 a.m., Old Colorado City History Center, 1. S. 24th St., $5; 636-1225, occhs.org.Navy Birthday Ball - Open to supporters of the sea services, civilian and active duty to celebrate the Navy's 240th birthday, 5:30 p.m.