Germany Subscription Upgrade
You want to travel again before the semester starts? Then get the Germany Subscription Upgrade, because with it you can from 13 to 26 September 2021 use the local transport service nationwide for two weeks at no additional cost.
In addition to a valid Verbund ticket, the prerequisite for participating in the subscription upgrade is a one-time registration via the campaign Internet portal. Interested parties can register here from September 6 and will then receive the free upgrade ticket by e‑mail. This ticket — printed or digital — must be presented at inspections. In addition to the registration form, the #BesserWeiter website also contains detailed information on the scope of validity, answers to frequently asked questions and numerous tips for excursions.
Source: https://www.h3nv.de/aktuelles/detail/das-deutschland-abo-upgrade