Are you all set and ready to publish your event? This is exactly what happens when you publish your event.
First of all, you can finally send out invitations to your attendees! Simply go to Users, select all Not yet invited, and use the arrow button to send them invitations.
How can you find out if an invitation was sent? Check their label in the tab Users - if it says "Pending", they received the invitation but haven't joined yet. Learn more about labels.

Depending on your settings, parts of your event might become visible on the internet. However, you can always restrict access, so only your attendees can join the event. Learn more about private events.
Note: Under certain circumstances, you are still allowed to make changes to your public events.