CCA Xi'an Rubiks Cube of Teenagers 2018 Announcement and Registration 2018-02-10 15:57 Chen Kang CCA Xi'an Rubiks Cube of Teenagers 2018 will take place on Mar. 11 in Xi'an, Shaanxi. The online registration will be open on Feb.22 20:00. Please check out the competition website for more information and registration.