The working day had been warm and muggy. But a delicate breeze was blowing at Lincoln Heart by the time the Primarily Mozart Competition Orchestra took the phase in Damrosch Park on Tuesday evening. The pianist Conrad Tao performed an elegantly unruffled Mozart concerto and a daydreamy “Rhapsody in Blue.” Apart from a sprinkling of small performances final summertime, this orchestra hadn’t been assembled because 2019, but it sounded relaxed and spirited. In just 3 many years, the team has become an anachronism. The pageant whose identify it bears — Lincoln Center’s premier summertime occasion in advance of the pandemic — is no extra. The center’s summertime, the moment a…