Boston Mayor Michelle Wu is not dreaming of a white Christmas — party, that is. An invite concerning the Boston mayor’s holiday party, specifically for “Electeds of Color,” was mistakenly sent by an aide to all members of the Boston City Council. Some 15 minutes later, that aide, Denise DosSantos, who serves as the mayor’s director of City Council relations, blasted up a follow-up email flagging the embarrassing error. “I wanted to apologize for my previous email regarding a Holiday Party for tomorrow,” DosSantos wrote. The white councilors were not supposed to receive an invite. “I did send that to...