What would you do?
Party like its the end of the world? Ykno, coz it is.
Mourn with your family and friends?
Pray like fuzzleberries to the first god that pops into your head?
I'd probably just party and love like nobodies business, rob stuff and just waste everything, also not wear clothes ever. Then in the last week or so just chill with the family and pray like a whore.
EDIT: also forgot to mention everyone knows the world is ending.
That means you can do anything! You wouldn't get arrested or anything because cops would be like forget that the world is ending anyway.