https://www.isu.org/synchronized-skating/events/synchronized-skating-calendar/eventdetail/12308/34/isu-world-synchronized-skating-championships?templateParam=11

Final Entries deadline is:

Thursday, March 18, 2021 – 20:00 Zagreb, CRO time (CET)

The entries will be published on the ISU homepage:

http://www.isuresults.com/events/wsysc2021_SynchronizedSkating.htm

ISU result page http://www.isuresults.com/events/fsevent00110299.htm