A hundred officials were given tickets after the district office approved the September concert, local reports said.
Staff at the Hamburg North district office told Der Spiegel it was "standard practice".
German officials are banned from accepting gifts.
The large number of officials at the concert had led to widespread criticism, Der Spiegel said.
More than 80,000 people attended the concert in September, with some reportedly paying €800 for a ticket on the black market.
