June 1 to July 4, "Explore! The Big Sky," Fort Benton, Great Falls, Mont.; or (406) 455-8451. Parades, fireworks, exhibits, tours, music. Admission ranges from $10 for a day pass to $150 for a month pass to $525 for access to 180 events, including ballet, opera, tours and a float trip.
Nov. 11 to 15, "Destination: The Pacific," various locations including the Columbia River, Long Beach and Station Camp, Wash., Fort Clatsop National Memorial and Fort Stevens State Park, Ore.; or (503) 861-4403. Events commemorating the corps' members arrival at the Pacific, with activities marking their winter stay through March 2006.
April 6 to 9, 2005, "Departure from Fort Mandan," Fort Mandan and Lewis & amp; Clark Interpretive Center near Washburn, N.D.; or (701) 462-8535. Reenactment, children's programs and other events.
Through Sept. 18, 2005, "A Fair to Remember: The 1905 Lewis and Clark Exposition," exhibit at the Oregon Historical Society Museum, 1200 SW Park Ave., Portland, Ore.; Open Monday to Saturday, 10 a.m. to 5 p.m. and Sundays, noon to 5 p.m. Adults, $8; students and seniors, $7; children 6 to 18, $5.
Through September 2005, "Tribal Lifeways Technology Exhibit," a living history Indian village as it would have been seen by the expedition, at Tamastslikt Cultural Institute in Pendleton, Ore., (541) 966-9748.
Through Dec. 31, 2005, "From Nation to Nation: Examining Lewis and Clark's Indian Collection," exhibit at the Peabody Museum, Harvard University, 11 Divinity Ave., Cambridge, Mass.; or (617) 496-1027. Open daily 9 a.m. to 5 p.m. Adults, $7.50; seniors, students and children 3 to 18, $6.

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