Let someone else manage your event

If you’re no longer responsible for an event you created, assign it to someone else to keep the event in place. They can then change the event as needed. Note: You can only transfer ownership of an event to someone who has a Google Account.

If you own an event, you can transfer ownership to another person in Calendar

In Google Calendar, click the name of the event in your calendar grid. Click MoreChange owner. Enter the email of the new owner and edit the message if you need to. Click Change owner.

Note: The new owner needs to accept the transfer of ownership of the event by clicking a link in an automatic email. Until they accept, you’re still the owner. If you create a Calendar event with a meeting link on someone's calendar, or transfer an event to their calendar, make sure you understand the video conferencing policies.