Add the calander to the mobile app.
In the mean time there is this: https://support.zwift.com/hc/en-us/community/posts/115000160163-Event-calendar-in-Ical-format-
Add the calander to the mobile app.
In the mean time there is this: https://support.zwift.com/hc/en-us/community/posts/115000160163-Event-calendar-in-Ical-format-