Subscribed calendar stopped updating or went blank?

Why it happens

Calendar feeds break more often than you'd think: a link expires, a server is down, or a scheduling app publishes an empty file by mistake. Your phone replaces your calendar with whatever it gets, so a broken feed can wipe your schedule without any warning.

What Calendar Corrector does differently

• If a feed comes back empty or unreadable, it keeps the last good version and tells you.
• If a feed changes a lot at once, it asks you to review the changes before they're applied.
• If a calendar hasn't updated for a while, you get a notification, and the calendar's name in Calendar says so.

Quick checks if your feed is stuck

1. Open the link in Safari. If it downloads a file or asks to subscribe, the feed works.
2. On a Mac, open Calendar › Settings › Accounts, choose the subscription and check how often it refreshes.
3. If the link has changed, ask the organizer for the new one and add it again.