Quick wins for a faster PC:
Repair Windows errors before they cause bigger problemsFix Now →Fix the driver behind crashes, sound loss and screen glitchesFind Drivers →Calendar spam has more than one cause, so no single toggle fixes it. Unknown senders can push invitations onto your calendar. Gmail can create events from confirmation emails. An app with Calendar access can add events or whole spam calendars. Each source has its own control. Used together, they cover most of the ways junk gets in without cutting you off from invitations you need. Google’s help pages don’t measure how well this works or promise that every kind of spam will stop.
Which control fits which problem
| Control | What it addresses | Main trade-off or limit |
|---|---|---|
| Add invitations: Only if the sender is known | New invitations from strangers | “Known” means contacts, your organization, or people you’ve interacted with. It may reveal to senders that they aren’t in your contacts. |
| Add invitations: When I respond to the invitation in email | New invitations, strictest option | You must respond by email before any event is added, including legitimate ones. |
| Report as spam | An existing event sent from Google Calendar | Doesn’t work for events created by another provider, app, or service. |
| Turn off Gmail events | Events inferred from Gmail confirmations | Also stops wanted travel and reservation events. |
| Revoke Android app Calendar access | Events or calendars created by an app | Doesn’t delete events already created. |
| Hide a calendar | Clutter from a calendar you didn’t create | Only hides it; the app can still create new ones. |
Step 1: Filter new invitations
This is the main gate against unknown senders.
- On the web, open Google Calendar and go to Settings → Event settings → Add invitations to my calendar.
- Choose Only if the sender is known to let in invitations from contacts, people in your organization, and people you’ve interacted with before.
- If you’d rather nothing appear until you act, choose When I respond to the invitation in email.
Choose based on how you work. The known-sender option rarely gets in your way, but it still adds anything from a sender Google counts as known. The respond-first option is stricter. It means answering legitimate invitations from the email notification before they show up.
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Three limits apply. Google Calendar Help says: “Your updated settings only apply to new invitations.” Spam already on your calendar stays put. On a work or school account, your administrator controls which options you can pick. And the known-sender setting might let senders see that they aren’t in your contacts.
Step 2: Report spam already on your calendar
- Open the suspicious event.
- Choose More actions → Report as spam.
Google says this removes the event, and for a recurring event it removes the whole series. There is a firm limit: “To report an event as spam, it must be sent from Google Calendar.” If the event came from another provider, app, or service, this path isn’t available. Go to Step 3 or Step 4 instead.
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Step 3: Check whether Gmail is creating the events
If the unwanted entries look like flights, trains, buses, hotel or restaurant bookings, or ticket and registration confirmations, Gmail is probably the source. Invitation settings don’t touch this mechanism, because it runs on Workspace smart features rather than incoming invitations.
- In Calendar settings, uncheck Show events from Gmail to hide them.
- Turn off Google Workspace smart features to stop Gmail from adding events at all.
Whether this matters depends on where you live. Google says the feature is off by default in the European Economic Area, Japan, Switzerland, and the United Kingdom, and on by default elsewhere. Some accounts don’t support it, including government accounts and accounts without Gmail. If your spam is plain invitations from strangers, you can skip this step. If you travel a lot, turning it off also removes helpful entries.
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Step 4: Review app access on Android
If junk keeps arriving as events or as entire calendars you never subscribed to, an app with Calendar permission may be responsible.
Free tools Windows power users keep installed
One-click scans. No signup required.
- Open Android Settings → Security & privacy → Privacy controls → Permission manager → Calendar.
- Remove access for any app that has no reason to change your calendar data.
Menus vary by device. Google notes that removing permission “doesn’t delete the events already on your calendar,” so you’ll still need to clear existing entries yourself.
Unwanted calendars
You can uncheck calendars you didn’t create to hide them. That only hides them. Google says stopping new spam calendars requires removing the app’s access. If the source is a third-party calendar provider connected in the Calendar app, such as a scheduling service, use that provider’s own help for spam controls.
A sensible order
- Set invitation filtering first, to stop the flow from strangers.
- Report what’s already there, if it came from Google Calendar.
- Check Gmail-derived events if the junk looks like bookings.
- Audit app permissions if the junk didn’t come through Google Calendar or keeps reappearing.
After tightening filtering, watch for a week or two for legitimate invitations that never appeared, and adjust if they did.
Quick Recap
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