Haute Route 2021 registration

How and where do I register for Haute Route 2021?

The main event schedule for 2/26-28 has not opened yet.
Look for it maybe Monday.
Zwift Hacks has a Haute Route filter that will pick up the scheduled workouts.
It will link to Zwift.com events.
Or try this link: https://www.zwift.com/events/tag/haute

Thank you.