A seminar on how to do business with Cobb will be held 5-7 p.m. April 9 at the Threadmill Complex, 5000 Austell-Powder Springs Rd in Austell. Businesses can learn how to become a county vendor, about local vendor preference options and will be able to network. To RSVP email Inger.Eberhart@cobbcounty.org or call 770-528-3317.