First of all, you'll need to log in to Slingshot Webmail 
Once you're logged in, click on the Calendar icon in the top red bar.


You'll be taken to the calendar screen.


To create a new Event, click on the date and rough time that you want the event to happen.
This will create a pop-up window for you to enter the details of the event:


Simply fill in the form with the details you require!

When you're finished, click on Save and then you're done!

If you'd like to set a reminder for your event, you can do this in the pop-up window. By clicking the plus icon on the right hand side you can also add additional reminders if you think you might sleep in