01 See #TiSDD 3.3, Journey maps, and #TiSDD chapter 10, Facilitating workshops, for hands-on tips on facilitation and how to build a safe space.
In a co-creative journey mapping workshop, invite participants who have solid knowledge about the experience you are mapping. If you want to create a journey map about customer experiences, this might mean inviting customers (yes, real ones!) and/or frontline employees. Be careful if you conduct this type of workshop with participants who only have a superficial or abstract knowledge of the experiences you focus on. The results might look convincing, but often they are very biased. For example, if an IT team without prior qualitative research and without deep knowledge of the daily lives of customers conduct a co-creative workshop on the journey map of their online customer experience, the outcomes tend to represent their idealized process rather than the actual customer experience. 
Think about inviting workshop participants with either a shared perspective (such as customers of a particular target group) or from differing perspectives (such as customers of various target groups or customers and employees). Clearly communicate the scope of the journey map, such as a high-level journey map vs. a more detailed journey map focusing on one specific situation within a high-level journey map.