By Denny Dyroff, Entertainment Editor, The Times   Blessing Offor There are two mid-week concerts in the area this week that will feature artists who are American citizens with international roots – Blessing Offor, who will perform in Philadelphia on February 17, and Paul Hernandez who will bring Katzù Oso to Ardmore on February 18. Blessing Offor will headline a show at the Foundry at Fillmore...