A source from this questionthis question quotes the Rema that one should be "joyous" on the night of Purim as well as the day. That citation doesn't explicity address getting intoxicated.
This site quotes many sources which link the mitzvah of intoxication on Purim directly to the seudas mitzvah.
Is there any obligation to get drunk on Purim, when NOT in the middle of the seudas mitzvah?
Indeed, is one even allowed to get drunk on the other hours of Purim, if there is no mitzvah to drink outside of the obligatory Festive Meal?
