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Use cases → Scheduling

Insert a calendar event for every user in the domain

Add an event to all users’ primary calendars using a delegated service account, and handle the quirks of large-scale insertion.

Who it is forIT automation teams or HR needing to push all-hands events or blackout periods onto user calendars.
APIsCalendar API
Typical scopescalendar

The problem

Manually inviting every user to a company-wide event causes invite spam and relies on users accepting. Direct insertion with delegation is cleaner, but bulk operations against the Calendar API introduce rate limits, silent skips, and inconsistent propagation.

How it works

  1. List all active users via the Admin SDK.
  2. For each user, impersonate their account and insert the event onto their primary calendar using the Calendar API.
  3. Batch requests with exponential backoff to handle quota errors.
  4. Log every insertion result and retry failures after a delay.
  5. Reconcile inserted events by eventId to confirm delivery.

What changes

Every user has the event on their primary calendar without needing to accept, and you have a verifiable audit of successful insertions.

The trap in this one. The Calendar API’s per-user and per-project rate limits are easy to hit when looping through large domains; exceeding them returns 403 or 429 errors, but some insertions may be silently dropped with no retry header. If you reuse the same eventId for idempotency, updating or deleting these events later is unreliable because event propagation can lag by several minutes—fetches immediately after insertion may show missing or partial results.

Watch it explained

“Google Calendar API in Python | Add, Update, Delete Events” — Jie Jenn on YouTube. Third-party video, included because it covers this ground well. We are not affiliated with the channel.

Questions people ask

Can I insert the same event object for every user?

Yes, but use a unique eventId per user or include the user’s ID in the eventId. This avoids collisions and makes later reconciliation possible.

How should I handle rate limits?

Implement exponential backoff and track which users were successfully processed. Expect to pause for several minutes on large domains.

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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