Revolve It can sometimes be tricky to find a thoughtful present for the special people in your life, which is why the best beauty Advent calendars are a saving grace for gift givers in need. These month- or week-long date holders contain full- and travel-size versions of some of the most coveted hair, skin, makeup, and nail products you’ll find all year, which means in addition to bringing a smile to a friend or family member’s face, you’ll also get more bang for your buck this holiday. Exclusive Advents from some of our favorite retailers, like Bloomingdale’s, Bluemercury, and Dermstore include a range of beauty finds from must-have brands that…