Nick Lachey and the rest of 98 Degrees dined at Davio's in Park Square after their performance at TD Garden. (The boy band played in between Boyz II Men and NKOTB.) We also spied Lachey and the lads chatting up Santoro's Deli diva Tina Santoro backstage. . . . Sweet Cheeks Q owner Tiffani Faison gave “Today” show hosts Kathie Lee Gifford and Hoda Kotb a grilling lesson. . . . Meanwhile, Abby Lane owner Jason Santos was on “The Talk,” showing hosts Sara Gilbert, Julie Chen, Aisha Tyler, and Sheryl Underwood how to make liquid nitrogen milkshakes. . . . Injured Sox outfielder Shane Victorino dined at Red Lantern the other night. . . . And Pats receiver Julian Edelman, who frequently tweets about his love of burgers, ate at Empire Asian Restaurant & Lounge while watching the Bruins game. . . . Lesley University alum Kitty Dukakis was among the guests hosted by president Joseph Moore. She was joined by her husband, former governor Mike Dukakis, and alum Smoki Bacon and her husband, Dick Concannon.