MANCHESTER – The 30th annual Tri-City Expo, a joint effort between the Greater Concord, Manchester and Nashua Chambers of Commerce, will be held at the Manchester Downtown Hotel, Center of NH, from 3-7 p.m. Sept. 27. Named New Hampshire’s “Best Networking Event,” by New Hampshire Business Review, the Tri-City Expo will feature over 200 New Hampshire businesses in the state’s largest business expo. The Tri-City Expo has opened registration for 2018 exhibitors. Those interested should visit or contact the Greater Manchester Chamber of Commerce at Admission is free to attendees.