Matt Damon may be one of the hardest-working guys in Hollywood – he’s got three films in the works right now – but he was still available to emcee Thursday’s fund-raiser for the Mass General Hospital Cancer Center. The evening, honoring 100 people and groups who’ve helped advance the fight against cancer, is near and dear to Damon because his dad, Kent, has been treated at MGH for multiple myeloma. (Kent was there with wife Celeste.) As guests were filing into the Westin Boston Waterfront, the actor talked about his connection to the event. “Obviously, it’s a great chance to honor these incredible people who are doing a lot for the cancer community,” Damon said, “and it’s a nice thing for my dad and I to be able to do it together.” Of course, we had to ask about his work, including the status of the much-ballyhooed Whitey Bulger biopic. “They’re writing a script so there’s not much to say,” he said. “It’d have to be a great script, but we have Terry Winter writing and he’s a great screenwriter.” Damon told us he was sorry to miss the Celtics game. ­“I think there will be a lot of doctors checking their iPhones. I’m sure some of the honorees will be mentioning the score.” But there was no doubt who he was rooting for: “That team has given us so much more than we ever could have asked for, so I’m enjoying it.” Aside from the Academy Award winner and his brother Kyle, guests included Dr. Jose Baselga, Vicary Graham, Dr. Daniel Haber, Aerosmith bassist Tom Hamilton, Robert Kraft, Jonathan and Patti Kraft, Stephen and Laura Lang, Michael Lorber, Putnam’s Bob Reynolds and wife Laura, former Genzyme CEO Henri Termeer and wife Belinda, throat doc to the stars Dr. Steven Zeitels. The evening also included a video tribute to Mary Dempsey from her brother, “Grey’s Anatomy” actor Patrick Dempsey. Mary is the executive director of the Patrick Dempsey Center for Cancer Hope & Healing at Central Maine Medical Center. Their mom, Amanda, is receiving treatment at Mass General Hospital.