Zhongshan Jucheng Primary School Rubik's Open 2017 Announcement and Registration 2017-05-19 13:22 Chen Kang Zhongshan Jucheng Primary School Rubik's Open 2017 will take place on Jun. 4 in Zhongshan, Guangdong. The online registration will be open on May.19 18:00. Please check out the competition website for more information and registration.