Info from Wikipedia
Crystal Ballroom, originally built as Cotillion Hall, is a historic building on Burnside Street in Portland, Oregon, United States. Cotillion Hall was built in 1914 as a ballroom, and dance revivals were held there through the Great Depression. Starting in the 1960s, the hall has also been host to many popular pop, rock, folk, blues and jazz artists, as well as beat poetry and other entertainment.
The Crystal Ballroom—the third floor of the building—has high ceilings, a balcony, grand chandeliers, murals, and wide floor-to-ceiling arched windows.
The room can be rented for group meetings of up to 1,000 people or, in concert configuration, up to 1500 standing persons or 850 seated.