Cowboy Feng's Space Bar and Grille

Cowboy Feng's Space Bar and Grille serves the best matzoh ball soup in the Galaxy, and hires some of the best musicians you'll ever hear. It's a great place to visit, but it tends to move around--just one step ahead of whatever mysterious conspiracy is reducing whole worlds to radioactive ash. And Cowboy Feng's may be humanity's last hope for survival
 
 
An unusual bar manages to move from planet to planet, avoiding each time an attack by nuclear weapons