Skip happy hour and head to this medical spa for gratis services, such as half-hour skin-tightening facials, 15-minute chair massages and mini-makeovers using Gotham Beauty Lounge makeup. Nutritionists will also be speaking about the latest in health-food trends, while providing samples of UrbanGreens juices. Be one of the first 100 attendees to receive a free gift bag filled with skin-care product samples and gift vouchers, such as personal training sessions and dental exams. R.S.V.P. to email@example.com is required.