How will you celebrate the new year? If you were in Sweden a century ago, you might have chosen a solo walk through a creepy, dark forest. In Chicago this year, you might go for a car rally/urban scavenger hunt (“Creative cheating” encouraged). From the medieval Feast of Fools to origins of “Auld Lang Syne,” here are some fresh ideas from the Atlas Obscura archives. Do Americans Sing ‘Auld Lang Syne’ Because of a Frat Party? by April White Just before midnight on December 31, 1929, Guy Lombardo and his…