MORRIS COUNTY — Although New Jersey has shown signs of progress from the worst of the omicron wave, an artist slated to perform at the Mayo Performing Arts Center postponed shows because of the variant. Richard Marx’s February 22 show has been postponed to November 2 after the Grammy Award winner decided to push back his February concerts. The Mayo Performing Arts Center will honor all tickets on the November date. People can contact the MPAC box office with any questions. Marx tweeted the following Tuesday: “My friends: Due to the recent surge of Omicron and for the safety of my fans, the Feb…