I recently booked a hotel for a wedding banquet, but the hotel said that all expenses need to be paid in advance?

You can only pay half or part of this. You also pay a certain catering deposit in advance according to the hotel regulations, and the rest can be paid after the end. I think this is because there is something wrong with the management mode and concept of their hotel, or it is different from others. You can talk to their manager again, and maybe you can get your wish.