NEW YORK — Mariah Carey has gifts to give this holiday season. The five-time Grammy Award-winning pop superstar on Monday announced two Christmas concerts, one in New York City and the other in Toronto. “It’s almost time NEW YORK + TORONTO!! Come celebrate Christmas with me this December!” she shared on social media. “lil’ excited lil’ excited to be back on stage and get festive with everybody!! Tickets on sale 10/28 at 10am on ticketmaster.com,” Carey added. Described by promoter Live Nation as a revue, the first of the two “Merry Christmas To All!” shows will be performed at Scotiabank Arena…