What's the difference between excitement and excitement? Adjectives transformed from past participles have passive meanings and usually need to take people as the subject. But now the adjectives transformed by participles have the meaning of causative action, and the subject is usually things, not people. Excitement means that the speaker is excited by something, so he has such an excited state; What is exciting is what makes people feel excited and excited.
To sum up, the correct word for the original question is excitement. It was a poetry festival and I was very excited.