Have you heard of StreetComplete? It's an Android app that shows you open questions/issues with OpenStreetMap in your area, and asks you to answer them.
It's made for people with no experience with #OpenStreetMap, so it shows only very simple questions that can be answered very clearly. ("What is printed on this street sign?", "What's the number on this house?")
Ich fahre am 11. März von Berlin nach Stuttgart (üblicherweise die Strecke via Hannover, Frankfurt, Mannheim, aber ginge auch via Leipzig), und kann eine Person kostenlos mitnehmen. Meldet euch, wenn ihr das brauchen könnt.