While celebrities sit in hair and makeup for hours the day of the Met Gala , in many cases skin care prep begins months before. “I like to start a good six weeks out, and that would be weekly facials for about five weeks, and then a treatment on the day of the event,” said Lord Gavin McLeod-Valentine , a Los Angeles-based facial masseur to the stars, and in-house brand representative and spokesperson for the Augustinus Bader company, who descends on New York City a couple of weeks before the first Monday of May. His client list includes Emily Blunt, Zoe Saldaña, Jonathan Bailey and many more. Related Articles “Now, I might recommend that they do some more invasive treatments within that initial period of time like a VI peel just to really cleanse and get those dead skin cells away. Maybe I’ll recommend something like Everesse to give them a bit of lift, depending on what time.…