Vestiaire Collective is turning to flash sales, treasure hunts, challenges and contests in a virtual summer festival to drum up sales activity as consumers emerge from the COVID-19 lockdowns and attempt resumption of normal life. Image credit: Vestiaire Collective France’s Vestiaire Collective has kicked off its inaugural month-long virtual summer sales festival to increase transactional activity on the resale platform as consumers emerge from COVID-19 lockdowns worldwide.