Google Calendar: Go to Settings → Add calendar → From URL, paste the subscription URL above
Outlook: Go to Calendar → Add calendar → Subscribe from web, paste the subscription URL
Apple Calendar: File → New Calendar Subscription, paste the subscription URL
Other apps: Look for "Subscribe to calendar" or "Add calendar from URL" option
Note: The subscription URL will automatically update when events are added or changed. You don't need to re-subscribe!
Sync timing: Google Calendar often refreshes subscribed calendars every 8–24 hours. New events may not appear immediately. To force an update: open Google Calendar → Settings → your subscribed calendar → click Refresh, or remove and re-add the subscription. For instant add of a single event, use "Add to Google Calendar" on the event.