The easiest way to add a meeting to your calendar is to rely on the meeting confirmation email you will receive after booking the meeting. It is structured to be recognised by major email providers as a meeting invite, so you should be able to click on "add to calendar" to have it added to your calendar.
You can also download a meeting file (.icf) from Ovida and then import it to your calendar. The meeting files can be accessed from the Home page or Meetings page.
Home page
Meetings page
Note: Importing differs by calendar (Microsoft Outlook, Google etc). Your calendar's help section will describe the process.