NEW YORK—Crowds will once again fill New York’s Times Square this New Year’s Eve, with proof of COVID-19 vaccination required for revelers who want to watch the ball drop in person, Mayor Bill de Blasio announced Tuesday. “Yes, we are proud to announce that Times Square, wonderful celebration in Times Square, the ball drop, everything, coming back full strength the way we love it,” de Blasio said at a virtual news briefing. “Hundreds of thousands of people there to celebrate. We can finally get back together again. It’s going to be amazing.” Tom Harris, the president of the Times Square Alliance, said all spectators aged 5 and over will be asked to show proof of full vaccination. People who can’t be vaccinated because of a disability will have to provide proof of a negative COVID-19 test, he said. The New Year’s Eve celebration, perhaps the city’s most iconic public gathering, …