One advantage of using Google Calendars is the ability to invite others to an event. When you are invited to an event, it will automatically add the event to your primary calendar and give you the ability to respond. The event will have a variety of circles in front of it (month view) or shading (week view) to indicate your response to the invitation. It will also notify the person organizing the event as to your status, if you have set it. (Here is a video on How to Accept/Decline an Invitation to an Event .) Included are how to do this both in Google Calendar, and from within your email. To accept/decline an invitation to an event while in Google Calendar: Find the event on your calendar, it will have white shading in the week/day view - Or a white circle in front for a view with more than a week- When you click on the event, you will have the option to respond at the bottom of the event. You can just click on your selection - ...