You’ve heard of Black Friday and Small Business Saturday, but artists based in Seattle and elsewhere want to add a new shopping day to your calendar: Artists Sunday. The campaign launched last year as a national public information effort to support local artists by encouraging people to buy local art on the Sunday after Thanksgiving. “The goal is to make Artists Sunday a part of the consumer consciousness, so it’s Black Friday, it’s Small Business Saturday, it’s Artists Sunday and Cyber Monday, and we’re not resting until that message is kind of universal,” said Chris Sherman, a Marion, Iowa-based photographer. Artists Sunday, a volunteer effort run by Sherman and Seattle-based…