Calendar invitation
Meeting request data sent as an ICS file attached to email or between calendar apps. You can respond with Accept / Decline / Tentative.
A calendar invitation is the data requesting attendance at a meeting, either as an ICS file attached to an email or sent and received between calendar apps. Google Calendar, Outlook, Apple Calendar, and others support it natively, and recipients can respond with “Accept,” “Decline,” or “Tentative.” As the end point of scheduling, it is the final form that is synced to every attendee’s calendar.
Elements a calendar invitation should include
What Accept / Decline / Tentative mean
| Response | Meaning | Display on the calendar |
|---|---|---|
| Accept | Will definitely attend | Shown as a confirmed slot |
| Tentative | Plans to attend, but may change | Shown in a pale color / with hatching |
| Decline | Will not attend | The event is removed or not shown |
| No response | Not yet decided | Shown with a ? mark. The organizer can send a reminder |
Calendar invitation etiquette
Etiquette for the sender
- Make the purpose clear in the subject (“Meeting” alone is a no-go)
- Separate required attendees from optional attendees
- If there is pre-reading, link to it in the body of the invitation
- Set the meeting length based on how long it actually takes (a 60-minute meeting is really 50 minutes)
Etiquette for the recipient
- Respond within 24 hours
- If anything is unclear, check with the organizer before responding
- If you cannot attend, add a brief reason
- Do not leave it at Tentative (give a formal response once you know)
Should you turn off automatic acceptance of invitations?
Outlook has a feature that “automatically accepts invitations as tentative,” and it is often enabled by default. It looks convenient, but it can also be the reason you notice conflicts late. As also mentioned in Techniques for resolving schedule conflicts, the safe choice is to switch to manual acceptance and build the habit of checking your own calendar as soon as you receive an invitation.