From july 15th to 18th everyone with an goorm account can try it out.

무제한 테스트
누구나! 무제한 ! 참여가능
7월 15일(목)~18일(일)

Unlimited test
Everyone! Unlimited! Can participate
Thurs, July 15 ~ Sun, the 18th

http://we.goorm.com/index.html

Sadly the Astonishia cbt2 seem to be canceled...