I hesitate to even divulge it. But just between you, me and the Internet, Ebbitt does an oyster happy hour, Monday through Thursday, from 11PM to 1AM when the raw bar goes half price.
Ebbitt's raw bar on the other hand is another matter entirely. It is magnificent. Glorious, even. It is six different kinds of raw oysters from a little bit of everywhere, whatever is fresh and in season. Big, small, salty, creamy, Pacific or Atlantic, they are always fantastic. And the jumbo shrimp are actually jumbo, huge hunks of shrimp, lightly steamed until bright pink and begging for a dip in the horseradish-laced cocktail sauce.