1: Save and exit first to publish what content you have so that it will provide the URLs of your event.
2: Then within publishing options you can open the reg page and others in new tabs.
3: Then go back and make an edit to reg page or whichever.
4: This time just click save and you will save the changes and remain in edit mode.
5: Then go to the appropriate page tab and refresh that page to see your changes made..