From the personal Gmail account:

1. On a computer, open Google Calendar and confirm you’re signed into your personal account.
2. Under My calendars, hover over your personal calendar.
3. Click ⋮ → Settings and sharing.
4. Open Shared with and select Add people and groups.
5. Enter your Google Workspace email address.
6. Choose a permission:
   • See all event details — recommended for a transition; lets you view meetings without accidentally modifying the personal calendar.
   • Make changes to events — useful if you want to manage personal events while signed into Workspace, but it still doesn’t make the Workspace account their organizer.
   • See only free/busy — best if privacy matters more than seeing meeting information.
7. Click Send.
8. Open the sharing email while signed into the Workspace account and follow its link.

The personal calendar should then appear in the Workspace account under Other calendars. You can give it a distinctive colour and toggle it on or off. Repeat this for any separate secondary calendars you use. Google’s official sharing instructions

This creates a live shared view: changes, cancellations and invitation responses continue updating. It does not migrate events, change their organizer, or make invitations addressed to the personal email belong to the Workspace identity.

If the Workspace account cannot accept or display the calendar, its administrator may restrict external/personal calendar access. In that case, the Workspace administrator would need to allow it; making the personal calendar public is not a good workaround.