1. TACA Tennessee Craft Fair at Centennial Park. There's also live music on Saturday (when is there not live music in Nashville?).
3. Porter Flea Market/Craft Show. Not quite in May but very close! This show has the reputation of being very good for/to its vendors and its in an old airplane hanger, which is pretty cool. One day only!
What other shows do you know about that are coming up?