copy a read only event to another calendar

use case:
copying an event from a read only calendar to a personal calendar

Issue:
Currently, if a google calendar (e.g. school calendar) is read only, we are not able to copy/duplicate any events within it to a personal calendar (e.g. synology calendar).
WIthout putting it to personal calendar, I will not be able to set a reminder.
What i currently need to do, is to
1. go to google calendar
2. duplicate the event to my own google calendar
3. go to one calendar on PC
4. Sync
5. Copy the duplicated event in 2. above to my synology calendar

You could just allow copy/duplicate in step 2, to a synology calendar which is syncing in one calendar