That's Burn'S Night - celebrates the life and work of Scottish poet Robert Burns (Auld Lang Syne, Comin' Through the Rye, My Love is Like a Red, Red Rose, etc., etc.). Held each year on his "birthday" (Jan. 29?). Often a bit of a celebration of all things Scottish (or not) as well - lots of tartan, bagpipes, haggis, ten-foot thick accents, Scotch, etc.

(Btw, I hope you know you're stirring up a hornet's nest - just wait till the Brits wake up - or come home from the pub - ).