Reply To: Yom Kippur like Purim

The Chidushei Harim has an interesting explanation for drinking on Purim with a story. A person collected a lot of money to perform an aveira. When he saw how some people were suffering, he forgot everything about doing an aveira and gave the money to them. They were so impressed in the heavens that they decreed that whatever he asks for should be granted to him. Making sure that he should not ask for something that they were not willing to abide by, they also decreed on him that the rest of his life he should be a drunk thereby he should not being able to think clearly. Purim is so great that all prayers are listened to that day, so we are commanded to drink in order not to ask for something that they are unwilling to grant.