Medieval fairs complete with knights, Dragons, music and crafts are super popular in Germany.
From the end of March onwards you will be able to enjoy events across NRW.
Below are links to the websites of the two major companies who stage medieval fairs. Both have a full calendar of events for this year. Some events are free others are ticketed expect to pay €10- €15 pp for the very largest events.
SudenFrei - This company has a touring show which has lots of events in NRW.
History Event - Based in Dusseldorf they put shows and evnts all across the Rhine area.