Can I update or edit events I didn’t create?

For events you did not create you may perform the following actions:

• Assign the event to an alternate calendar from your list of calendars
• Edit personal event reminders
• Add or respond to comments
• View and download attachments 

You may not edit event details (dates, times, etc.) or delete an event you did not create. The same permissions apply to users with whom you have created and shared an event.