How do I get the “Global Challenges” on the Apple Watch? I get monthly challenges, but not the special ones. Thank you.

The first (and simplest) thing to try if something isn’t working right is to restart your Apple Watch and its paired iPhone. If necessary (device not responding), try a forced restart. Both methods can be found here:

How to restart your Apple Watch - Apple Support

Restart your iPhone - Apple Support

If that doesn't help, the next steps would be to unpair and pair your watch again and restore from the backup just created. This should result in no loss of data. It deletes all temp and corrupted files and re-indexes the file system.

Unpair and erase your Apple Watch - Apple Support

Set up your Apple Watch - Apple Support

In the watch app;

Tap on activity and turn on "Special Challenges".

You should receive a notification for a special challenge about 3 or 4 days before the event.