For generations, Father’s Day had a certain low-maintenance charm: Fire up the grill, grab some beer and, if you’re feeling generous, gift him a tie, a goofy mug or a new power tool. But like fatherhood itself, the holiday is evolving. This year, Father’s Day spending in the U.S. is expected to reach a record $27.9 billion, according to an annual survey by the National Retail Federation, the nation’s largest retail trade group, and Prosper Insights & Analytics.