An event that started as a centennial celebration has now grown into an annual street festival. On May 18, a commemoration of the 102nd anniversary of what locals hail as the first air-freight shipment of fresh produce in the United States will take place in the Mullica Hill section of Harrison. It marks 102 years since 1,000 pounds of asparagus was shipped on a Fokker monoplane from Mullica Hill to Boston. “It’s local history, that’s the bottom line,” David Tinney, president of the Harrison Township Historical Society, told NJ Advance Media. “It’s what we do as a historical society. We interp…