Las Vegas Raiders coach Jon Gruden said several of his players made a mistake when they didn’t wear masks or practice social distancing during a charity event that violated league and local COVID-19 rules.About 10 players attended the fundraising event held Monday night by teammate Darren Waller’s foundation to raise money intended to help young people overcome drug and alcohol addiction.Players were seen on video without masks during the indoor event while talking and mingling with guests, who also weren’t wearing masks.“We’ve done a good job, done an excellent job,” Gruden said Wednesday. “Last night, it was addressed with our players.