On Friday, Dec. 22, Chad Porter, a singer, songwriter and musician from southern Maine, will be appearing from 8 to 11 p.m. at Pedro O’Hara’s, 134 Main St., Lewiston. Porter presents a wide array of material, from covering a Ray Lamontagne song to a Cee-lo Green song to a Blake Shelton song. On Saturday local artist Dave Perlman, a regular performer in Lewiston-Auburn, will be appearing from 8 to 11 p.m. Perlman covers a diverse selection of popular songs spanning different genres with a concentration in classic and ’90s rock. No cover.