WGBH’s Emily Rooney went floral at the 13th Annual High Hopes Gala for the Joslin Diabetes Center at the Westin Boston Waterfront on Saturday night. Other revelers at the benefit included IndyCar driver Charlie Kimball, Joslin CEO John Brooks, and “Better Living” reporter Liz Walker, who emceed the night. That red Mini Cooper behind Brooks and Kimball, which was donated by Herb Chambers, was raffled off during the party to the very lucky Laura Barletta, of Weston.