You can't change the privacy settings when you create an event in Facebook.If you created a private Facebook event that should have been public, what do you do?If you've set the wrong privacy level for your Facebook event, this wikiHow will show you how to change it.
Step 1: Have other invitees invite more people as well.
You can use the event's popularity to your advantage if you've already created a private Facebook event that a lot of people have interacted with.You can post within the current event, asking all attendees to invite their friends, instead of creating a brand-new event from scratch.Let them know you can't change the privacy to "Public" and encourage them to spread the word.If you have enough people invite their own friends, you can reach a lot of people.You can re-enable the option to allow guests to invite friends if you disabled it.The "Guests Can Invite Friends" switch should be turned on when you edit the event.Although it's possible for you and other guests to share your private event on your news feed or in a group, people who haven't been invited will not be able to find information about it.
Step 2: An identical event can be created.
You could easily make a copy of an existing event with the "Duplicate event" option on Facebook.You will need to create a new event from scratch because that feature is no longer there.When creating a replacement event, make sure to set it as public and add something to the title or description to make it seem like it's replacing a private event.If you want to keep the existing event, you can, but only if enough people RSVP'd for the new event.Send a message to attendees explaining why a new event was created.Encourage other attendees to do the same by sharing the new public event on your timeline.