If you have a calendar that you want to help a friend subscribe, this is how you do it:
Send them a link with the following <url> followed by the calendar id.
The url is as follow:
https://www.google.com/calendar/render?cid=
For example, if the calendar id is 2skpnamedhqnlhfesc3l77qvkk@group.calendar.google.com
then send them a link as follow:
https://www.google.com/calendar/render?cid=2skpnamedhqnlhfesc3l77qvkk@group.calendar.google.com
Try it out by clicking
here.
When the link opens, Google Calendar will ask whether or not to add the calendar
The Malaysian School Holiday calendar is used in this example