You can transfer calendars you own to other owners. You can also transfer events to another owner or calendar.
Tip: When you transfer events that contain a Google Meet link, the video conferencing policies applicable to that event are also impacted. Learn how transferred Google Calendar event settings apply.
Move events between calendars
To move an event from one calendar to another, you must:
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Be the organizer of a Google Calendar event.
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Have edit access to the calendar you move the event to.
When you move an event that recurs to another calendar, you do the same to future instances. You can’t move only one instance of an event that recurs.
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Open Google Calendar
.
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Tap the event
Edit event
.
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Under the name of the event, tap the calendar name.
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Tap the name of the calendar you want to move the event to.
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In the top right, tap Save.
Edit event 
.