Winterskol, Aspen's annual winter festival, opens on Thursday, January 8 with the Mad Hatter's Ball, a recently-revived Aspen event. Crazy hats, the sillier the better, are a must, so start planning your chapeau for the evening. The ball begins at 7:30pm at the Wheeler Opera House, with music by Jes Grew starting at 8pm. A "Best Hat" prize of two tickets to the Aspen Laff Fest will be awarded to the most original and outlandish hat. Details at www.aspenchamber.org.