Click Add calendar. The calendar appears on the left, under "Other calendars."
Tip:It might take up to 12 hours for changes to show in your Google Calendar.
Public calendar doesn't show on my calendar If a public calendar doesn't show on your main calendar, the file size may be too large. Google Calendar only works with files that are 1 megabyte (1MB) or smaller. To check if this is the issue:
If the error message "Could not fetch URL" appears, the public calendar may be too large. For a solution to import existing events only, go to the "Fix problems importing" article. Under the "Formatting errors" section, go to "ICAL file (file ends with 'ics')" "Check your file size."