Dozens of Nevada County potters throw their best effort into what some of them jokingly call “bowling.” And while those generous artists may joke, they know that to the people Hospitality House’s seventh annual Empty Bowl event is meant to benefit, the matter is one of life or death. “There’s a lot of talk about awareness. This is not just talk. This is action,” said Katherine Walden, one of the donor artists from Nevada City. “This is hopeful. People are tired of being helpless.” Every year, artists like Walden craft hundreds of colorful, handmade ceramic bowls for people to purchase …