We’ve re-designed how parents are sent their invite to parents’ evenings, 1-to-1 meetings set up by teachers, or events/clubs by school Admins. Parents can be sent an invite individually (for example when you are looking to prioritise invites/bookings to certain parents) and later you can send invites to everyone else. You can easily see who you have and have not invited.
This video very quickly describes the changes and how the new features work.