The Union Nevada County Home Show April 24-25 / grass valley plumber, Inside ABT, Uncategorized / By Andrew Twidwell ABT Plumbing, Electric, Heating & Air Conditioning- Grass Valley & Auburn Nevada County Home Show is next weekend 24/25. Stop on by our booth, we’ll be in the main building next to the front door. We’ll have info on new technologies and free swag. The Union Home Show.