you can return their tickets for the cancelled concert from the day after the concert was meant to take place. Returns can only be made at Philharmonic Advance Sales on Besední street, which is open on Monday to Friday from 1.00 pm to 7.00 pm. Fees are returned in cash; they cannot be put on a credit or debit card. You can return your ticket up to 90 days from the date the concert was to take place, although it is best to return it within a month of the date of the event.
Thank you for your understanding.