It’s a month too late for St. Patrick’s Day, but two new Irish restaurants have opened their doors in the Rockville/Potomac area. Lahinch, from the owners of the Irish Inn at Glen Echo, offers a menu of Irish and American dishes in the former Benny’s space at Cabin John Shopping Center. And over at Rockville Town Square, Finnegan’s Wake Irish Pub has opened for business at the Gibbs Street space formerly occupied by Carbon Peruvian Chicken.