You can take the little train from the taxi stand at Celle Castle to the CD-Kaserne – naturally, in AC/DC style and with the right sound.

There are three tours departing from there at 1:00 PM, 1:40 PM, and 2:15 PM. You can get your season ticket for the one-way ride, €3.00 per ride, directly at the organizing team's booth on the Friday of the fan meeting. (seats are limited: There’s a maximum of 30 per ride)
The big town festival will be held in the center of Celle on the fan meeting weekend: This gives you the perfect opportunity to get from there to the CD-Kaserne. Running right off the track!

Fan meeting tickets (Friday / Saturday / weekend) are available in the CD Kaserne online shop at Reservix:
https://cd-kaserne.reservix.de/tickets-internationales-acdc-fantreffen-2025-in-celle-in-celle-cd-kaserne-ggmbh-am-19-9-2025/e2323053 

...or at Eventim:
https://www.eventim.de/eventseries/internationales-acdc-fantreffen-2025-3861154/?affiliate=TUG