Friday, Aug. 11, from 8 to 11 p.m.,  singer and guitarist Ron Bergeron will be starting the weekend at Pedro O’Hara’s. He takes requests from a wide variety of genres, including quiet, sentimental pop ballads to high-energy rock anthems, country, blues and American standards.  On Saturday, from 7 to 10 p.m., Chris Robley, a songwriter, producer and award-winning poet, will perform. His orchestral indie-pop and Americana music has been praised by, among others, The LA Times and The Boston Globe. His poetry has been published in literary journals such as POETRY Magazine and Prairie Schooner.