Under the conditions of our "Fan Guarantee" programme you can modify a paid order up until three days after its creation, as long as the order was paid by credit or debit card. You should therefore contact us within three days of ordering. 

In the course of the last two weeks before the event takes place, orders can no longer be modified. 

Extra fees may apply when you modify an order.

More flexible rules govern certain events, notably long-running exhibitions.