Subscribe via E-mail

Click on the 'plus sign' on the lower right.  Then, set up e-mail reminders as described here:  https://support.google.com/calendar/answer/37242?hl=en

Subscribe on iPhone, iPad, Android device

Click the 'plus' sign in the lower right corner of the calendar

For iPhone and iPad, make sure the calendar is activated:  https://www.google.com/calendar/iphoneselect

Photo by Danielle Andes