Katherine C.H.E., a local singer, songwriter, and mother, will host some two dozen local musicians on Wednesday at 230 Elm in Southampton for “Sing the Peace,” a concert in which artists will perform a song about peace as they define it. Performers in the concert, which begins at 7 p.m., will be invited back to the stage for a grand finale jam. There will also be giveaways of peace and music-related items. There is no cover charge and no minimum drink requirement.