Sharing calendars is a great way to make your life simpler in trying to juggle all the things you have going on. Each calendar has a set of permissions, or access rights, which you assign. These permissions determine who can see, update, and post on your calendar. By default, only you can do things on your personal calendar, but you can change that. What you would do instead is create a new calendar, and assign alternate permissions on that calendar. Then you can subscribe your personal calendar to this new calendar so that you still have all the events in one place.

For instance, you could create a joint calendar for you and your spouse. Each of you would have a personal calendar, and each of you would have full rights to the joint calendar. Your spouse wouldn't go to your business meeting, so you put that event on your personal calendar (or go ahead and make yourself a business calendar), but a dinner date requires both of you, so you add that to your joint calendar. Since you have a subscription, the dinner date appears on your personal calendar.

How To Share A Calendar

Go to the calendar you want to share. If this is your personal calendar, click the button:
Click on the button:
Decide who you want to give access rights to. This can be only yourself, a select group of people, or everyone. Check the corresponding box, and enter email addresses or SmartCal IDs if you are giving rights to a select group of people.
Repeat the process for posting and update rights
Click on the button:
Encourage your friends to take advantage of the rights you have just given them by sending them a recommendation to subscribe to your calendar.