Sudbury’s Chris Evans attended Hollywood Stands Up to Cancer, a Tuesday event hosted by actress Reese Witherspoon and husband Jim Toth. Evans’s next big film, “Captain America: The Winter Soldier,” is expected in theaters in April.Mark Shanahan can be reached at email@example.com. Follow him on Twitter @MarkAShanahan. Meredith Goldstein can be reached at firstname.lastname@example.org. Follow her on Twitter @MeredithGoldste.