What do Joel and Daniel think is the reason Rosh wants names of those who will be at the banquet?

Joel and Daniel believe that Rosh wants the names of those who will attend the banquet to identify potential allies or recruits for his cause. They suspect he is looking to gather support for his revolutionary activities and may intend to use the gathering as an opportunity to persuade others to join his fight against the Romans. Additionally, they are wary that Rosh might have ulterior motives, such as seeking to eliminate those who oppose him.