Happily, “Sauced” is not merely fun; it’s smart, complex, and superbly danced. Choreographers Erica Buechner, Bradley Lundberg, and Blythe Barton pack so much substance into this suite of dances—the energy and speed of a jive number, quick shifts in level and direction, engaging dramatic tableaux, seemingly effortless changes in the cocktail bar set; there’s even a bit where dancers bring drinks to the audience.