Check the full event page for all the details: https://ddrcommunity.com/events/ecfa-2021/
The 6th COURSE TRIAL “SNOW WHITE” will be available starting February 11, 2021. The ranking period will end on March 24, 2021. Completing the COURSE TRIAL will unlock a new song: 「梅雪夜 / Qrispy Joybox feat. mao」 This trial will be available on all DDR A20 PLUS versions and regions.