It's been revealed that Mizuki Nana's Hong Kong concert, 'NANA MIZUKI LIVE EXPRESS 2019?,' has been cancelled. 

On her official website, it states that the concert was cancelled for safety concerns, "In view of the recent situation in Hong Kong, we fear that guests, performers, and staff could run into problems while accessing the venue as well as other unpredictable things that could potentially occur." The concert will not be rescheduled as they could not set any specific date. Details regarding ticket refunds will be announced via her official website.

Source: natalie