Does the calendar end

Fulffi,

If you are using iCloud, Apple states: iCloud: Limits for Contacts, Calendars, Reminders, and Bookmarks - Apple Support

"To help iCloud keep your information up to date, keep your data within the following limits:

Calendars and Reminders

• Total number of calendars, events, and reminders: 25,000
• Maximum combined number of calendars and reminder lists you can have: 100
• Maximum size of all calendar and reminder data (not including attachments): 24 MB
• Maximum size of all event attachments: 300 MB
• Maximum size of a calendar event including attachments: 20 MB
• Maximum number of attachments per event: 20
• Maximum number of attendees you can invite to an event: 300
• Maximum number of people with whom you can share a private calendar: 100
• Maximum number of characters in a reminder title: 100"

I interpret that to mean that users should expect to pare data when those limits are approached.