Sum Lok-kei sometimes thinks back to a one-day music festival he organised almost eight years ago, when he and long-time friend Jason Cheung played alongside a dozen alternative bands from Hong Kong and China in a marathon performance of hybrid indie sounds. The event took place in a now-closed venue called Focal Fair in the heart of Causeway Bay – one of the world’s most expensive shopping areas – and ran from midday past midnight, Jason recalls, adding that Lok was “rather crazy” to plan such an event. “It was a fun one,” Lok says in Cantonese. “And we have been wondering when we could do so…