How to allow Google Calendar invitations from unknown senders

Google Calendar has a built-in setting to prevent spam. By default, events are only added to your calendar automatically if you’ve interacted with the sender before. This affects all scheduling tools, including Calendly.

If you're using Calendly and a first-time invitee books with you, they may need to confirm the event before it appears on their calendar. This article shows how to update your Google Calendar settings so events from all senders are added automatically.

Default behavior

If your invitees haven’t interacted with you before, they’ll see a grey banner that says:

Unknown sender: not added to calendar yet

They’ll need to click I know the sender, then respond Yes to the invite for it to appear on their calendar.

Change your Google Calendar settings

To allow all invitations to be added to your Google Calendar:

  1. Open Google Calendar.

  2. Click the gear icon in the top right corner and select Settings.

  3. In the left-hand menu, select Event settings under General.

  4. Find Add invitations to my calendar.

  5. From the dropdown, select From everyone.

Tips to reduce no-shows

Here are a few ways to keep invitees informed and improve attendance:

Add a custom link to your confirmation page

  1. Open the event type you want to edit.

  2. Click More options at the bottom of the editor.

  3. Expand the Confirmation page section.

  4. Click + Add new link.

  5. Add the link and link name (e.g., For Google Calendar users).

  6. Select Save changes.