Mob Programming: Make sure that the person / people most associated with an item can attend, everybody else is optional

[NicoHambauer]

Rules:

Let the others know if you think that you can significantly contribute to a task because of your experience / knowledge / etc.

To stay flexible we make sure that Mob Programming remains optional.
The team member(s) who are most associated with an item can attend such a meeting and invite others. But to remain with a good team climate, this is optional that others are only invited, but not required to join.