What: The Colorado Chapter of the U.S. Green Building Council (USGBC) celebrates its five-year anniversary with a gala. Why: Colorado's a national leader in sustainable green building. Bonus: The evening's keynote speaker is Edward Mazria, an architect internationally recognized for his cutting-edge, environmental designs. Details: Fri 5:30-9:30 p.m. Denver Center for the Performing Arts' Seawell Grand Ballroom, 14th and Curtis streets. $85. Reservations accepted through Thursday 5 p.m. For more information, call 303-454-3393 or visit www.usgbccolorado.org .