If your holiday calendar’s looking as full as an A-lister’s, it’s time to plan like one (or like an A-lister’s personal assistant). Winging it won’t work — not for your schedule, wardrobe, gifts, or your skin. Successive late nights take their toll and makeup can do only so much to hide stress acne and eye bags. Follow these tips for glowing skin, flowing energy and a festive mood, and you’ll be the toast of the town instead of plain burnt out!