Click the button below to copy the url to your clipboard. Then in Apple Calendar add a new calendar. Select "Add Subscription Calendar". Paste the link into the field and press "Find".
The embeded calendar above has either an "Add to Google Calendar" link at the bottom, or a small + icon in the bottom right depending on your screen size. Clicking either of these will prompt to add the calendar to your google calendar.
If you would just like to do a one time add of all currently scheduled events to an existing calendar, you can click the button below.
Add To Calendar