Answer:
1. labor-intensive
2. commerce
3. draw
Step-by-step explanation:
labor-intensive makes sense because machinery makes things easier and less work.
commerce makes sense in the context, but it's also one of the only nouns, so grammatically, it works best.
draw means that it drew people in, so well-known artists would make people excited to come to the festival. It's also the only word that makes any sense grammatically.