NO RIGHT OF WITHDRAWAL
You do not have right to cancel tickets.
It is a consequence of the Danish Consumer Protection Act §18, para. 2, No. 12 that the usual 14 days right of cancellation in connection with distance selling does not apply to services provided in connection with leisure time offers when the agreement includes the date on which, or the period during which, the respective service shall be provided.
This means that when you have received your receipt and ticket, you cannot cancel the purchase and request a refund of the purchase price.