Log Home and Timber Frame Expo, 11 a.m. to 7 p.m., continues 10 a.m. to 7 p.m. Saturday and 10 a.m. to 4 p.m. Sunday, Portland Metropolitan Exposition Center, 2060 N. Marine Drive, $15 for three-day pass, children 15 and under free. Visit www.logexpo.com, or call 1-888-564-3976.
Spring Into Reading fair, 1 p.m. to 4 p.m., University of Portland, 5000 N. Willamette Blvd., Chiles Center. Call 1-800-564-3663.
Portland-area community meetings: Citywide land use, 7 p.m., City Hall, 1221 S.W. Fourth Ave., Lovejoy Room; University Park Neighborhood Association, Portsmouth Trinity Lutheran Church, 7119 N. Portsmouth Ave.; St. Johns Neighborhood Association, 7 p.m., St. Johns Community Center, 8427 N. Central Ave.; Sabin Neighborhood Association, 7 p.m., Sabin Elementary School, 4013 N.E. 18th Ave. Visit www.portlandonline.com/oni.
Green-building seminar, sponsored by Lane Powell PC, 7:30 a.m. to 9:30 a.m., Hilton Portland and Executive Tower, 921 S.W. Sixth Ave., Grand Ballroom 1, $25, paid at www.lanepowell.com or at door. Call 503-778-2043.
Changing Demographics in the U.S. and Oregon, Hispanic Metropolitan Chamber meeting, 11:30 a.m. to 1:30 p.m., Benson Hotel, 309 S.W. Broadway, $25, $20 members. To register, call 503-222-0280.
Relieving Transportation Congestion in the Corridor, presentation of the new statewide Cost of Congestion study, hosted by the Columbia Corridor Association, 7:30 a.m. to 9 a.m., Sheraton Portland Airport Hotel, 8235 N.E. Airport Way. Call 503-287-8686.
Astronauts Mark L. Polansky and Robert L. Curbeam Jr., speaking engagement, 10 a.m., Oregon Museum of Science and Industry, 1945 S.E. Water Ave., auditorium. Call 503-797-4000, or visit www.omsi.edu.
Author Robert Michael Pyle reads from his new book 'Sky Time in Gray's River,' 7 p.m. March 30, Audubon Society of Portland, Heron Hall, 5151 N.W. Cornell Road. Call 503-292-9453.
Events are free unless noted. See Page A2 to notify the Tribune about events. The full Crossroads calendar is at www.portlandtribune.com.