Those three ministers were all working at the imperial court, yet they were still inferior to the Imperial Master. So when the Imperial Master invited them to come and have dinner at his restaurant, they should definitely accept the invitation. It was just a dinner, and they shouldn't have a reason to turn him down.
If the three of them were present, then the other ministers and officers in the court would be present too. And if those noble people showed up at the restaurant, the rich people from the capital would come and join them as well. In this way, he could at least guarantee that Fortune Restaurant would earn enough money within half a month.
During this period, he would go and investigate the manager of the Luo's. He was going to see whether the manager had received authorization from the King or more importantly, from a prince. Then he would think about a proper solution.
That should be the best arrangement so far.