If you do, you commit an offense of wrong conduct. You should abolish one of them and do the observance-day ceremony in one place. And it should be abolished like this. A competent and capable monk should inform the Sangha: ‘Please, venerables, I ask the Sangha to listen. If the Sangha is ready, it should abolish such-and-such an observance-day hall. This is the motion. Please, venerables, I ask the Sangha to listen. The Sangha abolishes such-and-such an observance-day hall. Any monk who approves of abolishing such-and-such an observance-day hall should remain silent.