SharePoint Calendar - Prevent Double Booking

The default SharePoint calendar does not come with double booking prevention.

To fix the issue:

Calendar double booking detection and prevention functionality will be implemented by first adding a column for the event/location—in this case, the Meeting Room. Views for different meeting rooms will also be created. A new class library will then be incorporated, which will include custom event handlers for ItemAdding and ItemUpdating events.

Details & Directions: