Today is "National Clams on the Half Shell" Day, says the Grand Central Oyster Bar. They are celebrating with three specials ($10.95 each): Razor Clams Oreganata, Clams Casino, and Cherrystones on the half shell. Open for lunch and dinner. "Below sea level" at Grand Central Terminal, 89 East 42nd Street (map); 212-490-6650
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