Yes. My event is on 16 August. It is a non-repeat event.
I've set the 'close registration period' and 'close cancellations period' to 14 August.
Edit: When i clear the "Close cancellations period", it works.
Please advise if I've understood properly? Does "Close Cancellations Period" refer to the last day which cancellation is allowed? After this day no cancellation is allowed. So it seems strange that if there is no close cancellations period, cancellation is allowed. But if a date is set, cancellation is not allowed.