Google Calendar
Downloading the calendar .ics file
Simply download the OpenMBEE community calendar .ics file. A downside of this method is that the calendar can become unsynchronized. To overcome this you may wish to
Importing and synchornizing your existing calendar with the OpenMBEE Google Calendar
This method has the advantage of keeping your Outlook calendar synchronized with the OpenMBEE calendar. Simply

- Below the calendar widget, click on Add calendar

- Click on Subscribe from web and enter https://www.google.com/calendar/ical/jbdo6r6v614cpl21ru4enlr6k8@group.calendar.google.com/public/basic.ics

- You will be prompted to add a calendar name, color, icon, etc., but once done you will then be able to view the synchronized OpenMBEE calendar in Outlook.
N.B., you can do something very similar with Google Calendar if you wish to import the OpenMBEE calendar into your personal Google Calendar.