Invite people
Open an event on a directly connected Google or Microsoft calendar and add attendees by name or email. Contacts permission enables name and address suggestions. Save the event to let the provider send or update the invitation.
Attendee details show organizer and participant roles plus the response state available from the provider.
Review incoming invitations
Invitations can appear in the agenda, event details, a dedicated invitation list and notifications when enabled. InstaCal checks visible calendars and warns when the proposed time overlaps another busy event.
Reply
Choose Yes, Maybe or No. On supported direct Google and Microsoft accounts, you can include a comment or reply without sending an additional email where the provider allows that option.
A response updates the provider; other devices see it after sync. If an event came only through a read-only or Apple-managed route that does not expose provider reply controls, open it in the source calendar service to respond.
Tell the guests, or don’t
Before a change to a Google event reaches its guests, InstaCal asks whether to email them: Send invitation emails? when you create one, Send update emails? when you edit, reschedule or move it, Send cancellation emails? when you delete it — each naming the event and how many guests it has, with Send and Don’t Send. It is the choice Google Calendar offers on the web, asked once per change. Microsoft and Apple calendars follow their own providers’ behavior and do not ask, and changes made on Apple Watch or through Shortcuts always send.
Quiet a repeating invitation you are not going to answer
A repeating invitation you never reply to keeps prompting. Open it, and its actions menu offers Dismiss Series — the whole series stops nagging you, without sending a reply the organiser would see. Change your mind and the same menu offers Restore Series Notifications.
This is not a decline. Nothing is sent, your response stays as it was, and the events themselves remain on your calendar.
Declining by deleting
Deleting an invitation on a Microsoft 365 or Outlook calendar declines it rather than quietly removing it from your copy, so the organizer’s tracking stays right. Deleting an event you organized cancels it for everyone.
Change a response
Open the invitation again and choose the new state. InstaCal sends the updated response through the connected provider.
Tip: A conflict warning is advisory. It sees calendars currently available and marked visible or relevant; disconnected and hidden schedules may contain conflicts it cannot evaluate.
