Deutsche Bahn is offering the event ticket for the first time in cooperation with the German Tree Care Days. From any DB station, at a fixed price throughout Germany with the City-Ticket included.
Purchasing a ticket for the German Tree Care Days entitles the holder to purchase a discounted train ticket.
Bookings can be made at any time in the portal set up for this purpose
https://www.veranstaltungsticket-bahn.de/?event=12543&l=en
