Cancel attendance event button disappeared? (Rotterdam)

When not going to an event after all, it is nice to 'cancel attendance'. However, nowadays this button seems to have disappeared!

The guide says: 'To remove yourself from an Event click the Cancel Attendance button at the top right of the Event page. Please note; you may not remove you attendance from an activity or event that has already occurred.' But there is NO 'cancel attendance' button anymore 31 July Protected content .

There used to be one.

Please help....