When most NYC couples get married, their wedding does not shut down Manhattan’s iconic Fifth Avenue. Neither does it span five venues, six DJs, eight caterers, 10 choreographers, 16 fashion/jewelry designers, 400 guests and 8,000 flowers. There are no content creation teams; no swag-filled goodie bags; no off-Broadway theatrical productions to thrust the couple’s love into the literal spotlight — complete with 25 songs and dance numbers. But Pankti Doshi and Avish Jain — a South Asian power-duo who call the Big Apple home and wanted their five-day wedding extravaganza, held from April 21-25, to double as “a love letter to Manhattan” — could hardly be called an ordinary couple. The April 24 wedding parade of Pankti Doshi and Avish Jain traversed 51st Street from Madison Avenue west to 51st and Sixth Avenue before proceeding to Radio City Music Hall at 50th and Sixth.…