star took a trip down memory lane in his sendoff to 2017.Finn Aloe Blacc, Tove Lo, Bleachers, and Echosmith. Oh, and bonus: The concert is hosted by Nicole Richie, who's completely hilarious, not to mention super well-versed in all things music (she's married to Joel Madden, after all). “The majority of these incidents are preventable.” “As a survivor of gun violence, my personal experience with trauma affects everything I do every day. It impacts the places I feel comfortable going. It’s always in the back of my mind. It impacts my sense of security, how I view other people, and the lens through which I see the news and the world. Gun violence has shaped who I am and who I will always be…. It’s important people who haven't personally experienced gun violence understand how painful it is to relive that experience over and over again. I say that not because we should shy away from encouraging victims’ families and survivors from sharing their stories, but because we should always be aware that they are giving a piece of themself when they do that.”Haley