The band Fun., whose song “We Are Young’’ was inescapable last summer, played a short set at Wachusett Mountain Ski Area as part of Mix 104.1’s “Mix Lounge’’ series. A few hundred fans got to see Nate Ruess, Andrew Dost, and Jack Antonoff (above left) do their thing in Wachusett’s Granite Room. . . . At 72, legendary Motown singer Smokey Robinson’s still got it, at least according to folks who attended his sold-out show at the Wilbur Theatre this week. Wilbur boss Bill Blumenreich was there to congratulate Robinson (above right) on his 50th anniversary in the music business.