What does popular Hong Kong bar Club 71 have to do with June 4th?

Video produced by Vicky Feng and Robin Fall for the South China Morning Post 

Club 71 in Hong Kong’s Central district looks like an ordinary bar but, it is far from it. It opened as Club 64 in 1989 in response to the Tiananmen Square massacre on June 4th. SCMP’s Bernice Chan speaks to now-owner Grace Ma Lai-wah about how the bar and Hong Kong has changed since then.