Gringos & Mariachis, a new Mexican concept from the owners of Olazzo, will open a second location at Park Potomac next summer across from Sugo and MoCo’s Founding Farmers. Gringos, which opened on Cordell Avenue just 18 months ago, has established an enthusiastic following for its tacos, nachos, guacamole and fresh margaritas. The new restaurant will be a bit larger than the one in Bethesda, with seating for 100 inside and 50 outside. “The menus will be similar to each other, but we’ll switch things up here and there,” says co-owner Roberto Pietrobono, who runs the Bethesda restaurant with brother Riccardo and business partner Marc Miranian. Gringos is the first restaurant to publicly announce a deal for the next phase of Park Potomac. From what we hear, developers also have been talking to an ice cream shop, a pizzeria and a sushi restaurant.