There are no direct trains that week due to engineering works in Denmark. Rail Planner hasn't been updated yet. Please do not use that app for planning, instead use bahn.com.
There are rail replacement buses for part of the journey but frankly I wouldn't recommend doing it during the night. You'll need 2 pass days too unless you pay for Copenhagen - Slagelse.
- IC København H - Slagelse 23:02 - 23:54
- Bus Slagelse - Fredericia 00:06 - 02:01
- IC Fredericia - Hamburg Hbf 02:21 - 06:26
Either you take daytime trains (+ bus) or a ferry like Trelleborg - Travemünde/Rostock (30% discount with the pass).