iOS 27 brings several upgrades to Apple Calendar, including natural-language event creation powered by Apple Intelligence, which can automatically fill in event details from a simple text description. The app also gets a refreshed design for viewing and editing events, adds a long-requested Busy/Free status option for iCloud calendars, supports new extra-large widgets for showing more upcoming events and reminders, and benefits from major Siri AI enhancements, including the ability to create events by scanning flyers and understanding personal context and on-screen content.