Cover a table with several layers of newspaper. Fill a 42-quart stockpot fitted with a steamer basket insert about three-quarters full with water. Bring to a boil over medium heat. Add the beer, Old Bay Seasoning, salt, potatoes, lemons, garlic and bay leaves. Cover and cook for 10 minutes.
Add the kielbasa and corn. Cook for another 5 minutes. Add the crabs and cook for another 6 minutes.
Meanwhile, melt the butter in a small saucepan. Divide among small bowls.
Pull out the steamer basket and let it drain over the stockpot. Pour the contents of the basket out onto the covered table. Sprinkle the 2 tablespoons of reserved Old Bay Seasonings over the crab boil on the table. Serve with the butter for dipping.
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