Yes, it's finally here. The season every good little corporation in America dreams of all year long. The season when ledgers will go from red to black, budgets will be met, and oh yes, peace on earth, family togetherness, turkey (the bird, not dear Uncle Joe) and all of that other stuff. But hark, it can also be a season of giving as well as shopping. And lo, here's a swish charity free-for-all you won't want to miss: The Design Industries Foundation Fighting AIDS has created a winter wonderland (the feel, if not the weather) in its 12th annual DIFFA Rouge affair. Sip wintry-themed cocktails, munch Yuletide bites and bid in a silent auction on all things holiday from designer stockings (to be filled with oranges and candy canes, not feet) by Narciso Rodriguez, Bottega Veneta, Lilly Pulitzer, Missoni, Moschino, Todd Oldham, Vivienne Tam, Zac Posen, Armani, Emilio Pucci and others, to designer wreaths and every other kind of festive gift. And of course, Santa will be there. Tell him I've been a very good girl this year, will ya?