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Preheat oven to 400 degrees F.
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Lightly oil a large, rimmed baking sheet or coat with nonstick spray.
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In a large pot of boiling salted water, cook potatoes until just cooked, about 10-13 minutes.
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Stir in corn during the last 5 minutes of cooking time, remove corn and potatoes and bring pot back up to a boil.
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In a small bowl, combine butter, garlic, Old Bay and thyme; season with salt and pepper, to taste.
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Place potatoes, corn, mussels, clams, shrimp, chorizo, onion and lemonsĀ in a single layer onto the prepared baking sheet. Stir in butter mixture and gently toss to combine.
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Place into oven and bake for 12-15 minutes, or until all the mussels and clams have opened.
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Meanwhile, place lobsters in pot of boiling water and boil for 10 minutes. Remove and plunge into a pot of ice water to stop the cooking process.
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Pour seafood onto your largest serving platters and arrange lobsters. Serve immediately, garnished with parsley, and served with melted butter and lemon if desired.