I have a SharePoint calendar, with a little over a dozen columns (I have also added a couple extra columns). When adding/editing calendar events, I notice that the Attendance column is not showing up as a field. If I look in SP Designer, I see the column, Attendance, but it shows a blank Content Type (whereas most all the other columns have a Content Type of Event). Can someone please talk me through this? Not only do I need the Attendance column to be a field for a calendar event, but I have the same calendar on many other sites, so hopefully I can update the Content Type for the Attendance column to Event and solve my problem. Please advise.