LEWISTON — Patrick Dempsey, Buckfield native and Hollywood star, is home for the ninth annual Dempsey Challenge, a fundraising event for the Dempsey Center in Lewiston. Between hugging adoring fans, talking with cancer survivors and pumping up the crowd, Dempsey talked Saturday about his plans for the future of the Dempsey Center, what the Challenge means to him and what he’s been up to. Dempsey, who was born in Lewiston, founded the center in 2008 to provide quality-of-life care for people affected by cancer.