Final answer:
To meet the given requirements, create a new class that inherits from the base class. Add a private data item for the host city, a default constructor, a method to set the host city name, and an overridden function to display ticket quantities with the host city name.
Step-by-step explanation:
In order to meet the given requirements, you will need to create a new class that inherits from the base class. This new class should have a private data item to store the name of the host city, a default constructor that assigns 'Stockholm' to the host city name, a method to set the name of the host city, and an overridden function to display all three ticket quantities for a concert with the name of the host city included.