Not only can you add items to your group’s calendar seamlessly as you send notices, but you can also create large numbers of items quickly to appear on your group’s members household calendars and Start Page (or “At A Glance” page) by simply using the functionality of “Group Calendar” located on the “Customized Administrative Start Page”. (In the near future this will become the default admin page)
Note: when group calendar items are placed on the calendar, they are not sent out through email. If you wish to send out an email also, simple create your notice through the “Take Action” function and the event, deadline or announcement will be auto added to the calendar. Do not then add to the group calendar.

Click on the "Actions" button and select "Manage Categories". After entering in the required and optional fields you desire click on the green "Save" button.
Repeat as needed.