Add meetings to the site Calendar
Go to Sign-Up
Select the Sign-Up tool from the Tool Menu of your site.
Click on a meeting title
To change any of the initial settings of the meeting, use the Modify option shown at the top of Meeting Details.
Click Show the other default settings.
The information described in Create a meeting will be shown for editing the settings of your choice.
Check Publish to Calendar.
Select the check box next to Yes, publish the meeting to the Calendar tool.