Tonight is opening night for the Walker Art Center's most popular film event -- the annual screening of the British Television Advertising Awards.The programs draw more than 10,000 people each year and are consistently sold-out. Audiences will get to see the best of British advertising -- from campaigns featuring a male streaker to avant-garde ads for hot noodles and automobiles. Here's an example: Peter Bigg, the administrator for the British Television Advertising Awards, will speak at tonight's screening. He says the 27th annual event showcases a collision of art and commerce.