I don't see how a court can do anything here.
No offense to Seth, but this seems dumb. Of course, I don't know all the details behind it, but it sounds strange to me.
Band X wants to play the 930 Club (or DAR or Merriweather) because they've played there in the past and had the best experience of their tour. They're coming back around, unfortunately not able to work with the same promoter because the giant umbrella owner Live Nation is telling them, you MUST play Venue Y otherwise you will breach some silly performance contract.
This is happening all the time with bands being forced and told where they have to play rather than allow the band's own booking agent to conduct the business with long-term relationships they've established from city to city with various local promoters.
It's only going to get worse once the Fillmore is in and I believe that is also what Seth is trying to cut off and avoid happening before they open the doors.