FRANCIS KOKOROKO and COOPER INVEEN AS the sun set on a courtyard of shipping containers in Ghana's capital Accra, young men and women in Pink Floyd, Grateful Dead and tie-dye tees bartered over army surplus jackets and Adidas sneakers while a live deejay spun Afrobeat classics. The Vintage Gala, as 23-year-old founders Prince Quist and James Edem Doe Dartey dubbed it, brought together a movement of young vintage enthusiasts pushing back against the global fast fashion industry by encouraging their peers to shop secondhand. "If you wear clothes that were made back in the day...you're helping the environment by not…