In January, Brittany Lo, the founder and chief executive of Beautini, a bridal beauty company in Manhattan, traveled to Oaxaca, Mexico, for a friend’s wedding. Come March, Ms. Lo will be in Jersey City, N.J., attending another friend’s wedding. And two days later, in Miami for a third. Though Ms. Lo, 30, works in the industry, the events that she has gone to are not work-related.