How to set country registrations for the event
If the event registration should be limited by nationality, such conditions can be added to the capacity rules of the event.
Add a new capacity rule (or edit an existing one).
After setting Name, Type and Limit you click '+ AND' and add the Country condition. What you've done here is basically said "All athletes that doesn't have a Swedish nationality can register zero times (can't register at all)." Don't forget to hit Save!
Allow for multiple nationalities
Say you want to allow for Swedish and Norwegian nationalities. If so, click the '+ AND' button and add Norway as well: