THE VACATION-RENTAL MARKET is white sizzling proper now. All these delayed weddings, scuttled household reunions and muffled milestone celebrations created a pent-up demand for journey that’s out of the blue gushing like a geyser. If Christmas 2022 appears far-off, suppose once more: Prime journey advisers report that “festive” bookings are already going gangbusters, 10 months upfront—whether or not it’s multiple-family teams decided to converge in an enormous ski chalet in Gstaad or three generations planning to alight in a teak and shingle hideout in sunny St. Barts. This can be a very wealthy pie, and luxurious resort manufacturers need a piece of it. And they also’re transferring into the market…