If you want to add the Grace for Dover: Arise Calendar to your own Google Calendar or smartphone, follow these steps from Google:

Subscribe to calendars in Google Calendar

To add a calendar using its address, follow these steps:

1)  Click the down-arrow next to Other calendars
2)  Select Add by URL from the menu
3)  Grace for Dover’s iCal address is:
4)  Enter the address in the field provided
5)  Click the Add Calendar button. The calendar will appear in the Other Calendars section of the calendar list to the left.