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Think the squabble over D.C.’s new convention center is big? It’s nothing compared with the one over the “Big Dig.” In order to shove a superhighway under downtown Boston, builders are spending more than a billion bucks per mile—buying goodies like noise-proof windows for artists’ studios and fish-protecting underwater devices to soothe foes. More than just a highway scheme, the Big Dig is an archetype of the new urban megaproject: Plans still get shoved down neighbors’ throats, but nowadays they’re accompanied by architectural gymnastics—and buckets of cash—to soothe environmental, community, and political concerns. Harvard scholar David Luberoff dishes dirt on the Dig, and other famous projects such as Denver’s new airport and L.A.’s Century Freeway, at 6 p.m. at the National Building Museum, 401 F St. NW. $12. (202) 272-2448. (Michael Schaffer)