Final answer:
The purpose of the banquet in question is to raise funds for a charity.
Step-by-step explanation:
The purpose of the banquet mentioned in the given information is to raise funds for a charity.
The text provides clues such as 'the guests were obliged to assist' and 'this is the meal equally set, this the meat for natural hunger'. These suggest that the banquet is not for celebratory purposes or to honor someone, but rather to raise funds for a charitable cause.
Therefore, the correct answer is 4) To raise funds for a charity.