LAS VEGAS—Las Vegas isn’t canceling or scaling back plans for big New Year’s gatherings amid concerns about the spread of the Omicron variant of COVID-19, regional public safety and elected leaders said Wednesday. More than 300,000 visitors are expected in town for events including a New Year’s Eve fireworks show on the Las Vegas Strip that was canceled last year due to the coronavirus pandemic. Thousands of ticketholders also are expected at a multi-stage outdoor music event beneath a canopy light show at a downtown casino pedestrian mall called the Fremont Street Experience. “If you’re sick, stay at home. If you’re indoors, wear a mask,” said Michael Naft, a Clark County commissioner who stood with Las Vegas Mayor Carolyn Goodman and police, fire and communications center officials to outline restrictions including bans on glass and metal containers, coolers, strollers, backpacks, purses, and luggage. “We encourage everyone to look out for …