This proposed event didn’t seem possible. How could the boss say yes to this? But Seattle architect George Suyama is one hell of a creative boss—he has an installation art gallery in the middle of his firm—and he’s allowing 2,000 pounds of solid plaster to come crashing to the floor in that gallery tonight. What’s being demolished is an artwork by Ian McMahon consisting of white curtains 20 feet long and 40 feet wide. They’ve stood for months. One has already been dismantled. Watch the other, with the swing of a bar, become dust. Don’t blink. (Suyama Space, 2324 Second Ave,, 5 pm, $25, includes yearlong membership to Suyama Space)