someone from realayu (hk ayu forum) found this website:
http://tube.hk/ch/music_events-200809-20
It says ayu's HK concert is on Sept 20th at asia expo arena. I'm so glad its not the HK coliseum anymore...it was too small for her stage. The site also has other foreign artist's concert dates such as Alicia keys...so I dunno how reliable the site is.