Within Teamwork, you can quickly add a new event from any area of your site via the quick add menu.
Select the Quick Add ( + ) option in the main navigation menu on the left of your site. In the quick add menu, hover over More and choose Event from the pop-out menu.
The Add Event modal will allow you to enter details such as when, where, who and add reminders for the event.
For more information, see: Using the Quick Add Menu