Invite Others to Calendar Events in Mountain Lion
Besides keeping track of your own life, you can use the Calendar app in OS X Mountain Lion to plan events, such as business meetings, luncheons, or even get-togethers with friends. To invite other people to your event, you can open Contacts or the Calendar Address Panel (Window→Address Panel or Command+Option+A) and drag the contacts onto the event in Calendar.
Alternatively, you can type the first few letters of the name in the Invitees field, and names that match magically appear. In the following figure, after the letters st were typed, and Calendar offered a choice of two contacts with names that start with st — namely, Stan LeVitus and Stan Lee. Sweet!
After you’ve added one or more invitees, click the Send button to invite them to the event. If the invitees have Calendar (or its predecessor iCal), they can open the enclosure (which is included with your invitation e-mail), which adds the event to Calendar with Accept, Decline, and Maybe buttons.
All they have to do is click the appropriate button, and you receive an e-mail informing you of their decision along with an enclosure that adds their response to the event in Calendar. Nice, eh?
If the invitee doesn’t have Calendar (or doesn’t open the enclosure that was included with the e-mail invitation), he or she has to respond the old-fashioned way: by replying to your e-mail or calling you on the telephone.