Final answer:
The sentence provided is complete, with both a subject and predicate present, indicating a complete thought.
Step-by-step explanation:
The sentence in question, “Camille and Bill Anthony, authors of The Art of Napping at Work, are even promoting a new holiday, National Workplace Napping Day.” is a complete sentence. It has a subject (“Camille and Bill Anthony”) and a predicate that tells what the subject does (“are even promoting a new holiday”). This construction meets the criteria for a complete sentence, as it expresses a complete thought and has all the necessary components, including a verb and a subject.