Subscribe To Calendars Using Outlook
These are the instructions to use to subscribe to one of the Cedar Rapids Community School District calendars in Outlook 2016. Other versions of Outlook will be similar.
Instructions:
On the "Subscribe to Calendars" webpage, copy the url of the calendar you want to subscribe to
Open up Outlook
Click on the calendar icon 
Right click on "My Calendars"
Click on "Add Calendar"
Click on "From Internet"

Paste the link into the New Internet Calendar Subscription textbox

Click OK.
On the Advanced button enter the name of your calendar

Click Yes to the Add to Internet Calendar dialog box
A new calendar will be added