Scoring a spot at NYC’s upcoming Met Gala is just the beginning for boldfacers and A-listers lucky enough to be included in the top social event of the spring season, held on May 6 this year.  What follows the sought-after invite is months of preparation. There are fittings to attend at top ateliers, high-priced hotel suites at The Mark to secure — and, for many, trips to Joanna Vargas’ glossy Fifth Avenue spa to achieve that camera-ready glow.  Naomi Watts, Rachel Weisz, Laverne Cox, Emma