The first step is to negotiate with the hotel. Even if the hotel says that the boss has changed (mostly deceptive, just trying to raise the price), as long as the official seal has not changed, the hotel has not changed. Since they are the same hotel, they should act according to the contract. This can minimize the loss.

The second step is to see if other hotels can book seats at the same time. It's good that this hotel can be negotiated. In case of deadlock, it is best to have a backup hotel. Besides, it's best not to hold a banquet for such dishonest businessmen there.