This is the 8639th most frequent German word.
konzertkasse
A "konzertkasse" is a concert ticket office or box office.
Here, 'Konzertkasse' refers to the physical box office where tickets for concerts are bought or collected.
Ich habe meine Tickets an der Konzertkasse abgeholt.
I picked up my tickets at the box office.
In this sentence, 'Konzertkasse' is used to indicate the business hours of the ticket selling location.
Die Konzertkasse öffnet um 10 Uhr morgens.
The box office opens at 10 AM.
Here, 'Konzertkasse' is extended metaphorically to include online systems for purchasing tickets.