In two-pane layout, select Calendar from the service selector panel in Convergence UI .
In three-pane layout, click the Hamburger menu (three line menu icon) in top corner of the Convergence UI, then, click Calendar.
The Calendar tab appears in the right pane.
Click any calendar view from the Calendar toolbar.
The following views are available:
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Day
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Week
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Next 7
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Month
Click the time during which you want to create the event.
Based on the position where you click, the nearest approximate time is chosen. The time slots are available in 15 minutes duration. A callout appears displaying a text area where you can enter the event details. By default the event duration is 1 hour. To increase or decrease the duration of the event, you can drag the event by using the mouse pointer.
OR:
Drag the mouse pointer from one point of time to another during which you want to create the event. When you release the mouse button a callout appears displaying a text area where you can enter the event details. The total time you have selected by dragging the mouse pointer is taken as the duration of the event. Increase or decrease the duration of the event by placing the mouse pointer close to the two parallel horizontal lines shown close to the bottom of the event, clicking and dragging down/up.
Enter the event details in the text area labeled Event:.
The quick-add event functionality enables you to create an event based on the provided description. For example, if you provide the description 1pm lunch at the Counter in the text area, the event attributes that are assigned to the time, location, and title are 1pm, the Counter, and lunch respectively.
Click Create Event.
Note - The quick-add functionality creates a simple event with the time, date, event name, and the description attributes. To create an event with more attributes such as reminders, recurrence, and attachments, see 
How Do I Create an Event?