Tonight is the last chance to see “Melody Cavalcade” by the Greater Lowell Music Theatre at Fisher Recital Hall in Durgin Hall at UMass Lowell, South Campus. Last night’s show was a smash. The packed house raved. Where else can you see local performing-arts titans Jerry Bisantz, Michael Lally, and Jack Neary on the same stage? Old-time live radio style production. Just a few steps from Broadway (St.), overlooking the mighty Merrimack River.