The Great Hall is open to the public, you must reserve a spot in advance. How is the comma used incorrectly in the sentence above? The comma attempts to separate a compound predicate. The comma attempts to join two independent clauses. The comma attempts to set apart an essential element. The comma attempts to separate a compound subject.

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Comma is used incorrectly in the sentence The Great Hall is open to the public, you must reserve a spot in advance because it attempts to join two independent clauses. Instead of a comma, you should use a semi colon here.

Answer: The comma attempts to join two independent clauses.

These two sentences are independent clauses. We know this because they both have a subject and a predicate (including a verb). These sentences would work better if they were separated by a period. Alternatively, they could also be joined by a semicolon.