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Send email or messages to invitees
Easily send an email or message to all of the people invited to an event.
Control-click the event.
Choose Email All Participants or Message All Participants.
Enter text for your email or message, then send it.
If the event has a phone number listed in its notes, and your Mac is set up to make phone calls, you can click the phone number to call it. For more information, see Make and receive phone calls on your Mac.