As many people had been predicting, Fuji Rock Festival 2020 has now officially been postponed.
The organisers, Smash, are planning to hold the next festival in August of 2021. Ticket holders can choose to get a refund or use their tickets for Fuji Rock Festival 2021.
https://en.fujirockfestival.com/news/fuji-rock-festival-20-notice-of-postponement/