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Use cases → Scheduling

Bulk calendar sharing for project teams with delegation

Share team calendars at scale across multiple users and groups using a delegated service account, avoiding manual access management.

Who it is forWorkspace admins managing access for rotating project teams.
APIsCalendar API, Admin SDK
Typical scopescalendar, admin.directory.group

The problem

Manually sharing calendars with dozens of users or groups is slow and error-prone, especially when teams change frequently. Delegated automation can handle scale, but sharing settings can be inconsistent if not managed centrally.

How it works

  1. List all relevant users and groups using the Admin SDK.
  2. For each project calendar, use the Calendar API with domain-wide delegation to add ACLs for each user or group.
  3. Track changes to team membership and update shares accordingly.
  4. Log every change for audit and rollback.

What changes

Project calendars are shared or revoked in bulk, with consistent access across the team and minimal manual intervention.

The trap in this one. When adding ACLs via the Calendar API, silent 409 errors are returned if the ACL already exists, but these don't always indicate a true duplicate—if the role has changed, the API will not update it unless you first delete the old rule. This means users can end up with outdated permissions unless you explicitly fetch and compare existing ACLs before writing. The pattern fails quietly, so permissions can drift until someone notices.

Watch it explained

“How can I integrate my Google Calendar with Google Sheets in Gmail or Google Workspace?” — The Gmail Playbook on YouTube. Third-party video, included because it covers this ground well. We are not affiliated with the channel.

Questions people ask

Can I share with Google Groups instead of individual users?

Yes, but group membership changes can take hours to propagate to calendar access. Always test with a new user in the group before relying on immediate access.

How do I handle users leaving a project?

Remove their ACL entry with the Calendar API, and verify the deletion, as changes can be delayed if the calendar is heavily shared.

Want this built?

This is a pattern we run in production. We will set up the delegation and build this on top of it — $500 per hour, most of it working the same day.

Talk to us Or read the setup guide

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