The Manufacturing Energy Summit will be 8:30 to 11 a.m. Tuesday, Dec. 4, at the North Central Massachusetts Chamber of Commerce, 860 South St., Fitchburg. The keynote speaker will be Department of Public Utilities Commissioner David Cash. Following Cash, others will speak about direct purchasing, bill auditing and more. There is no cost to attend. Contact 978-353-7600 or chamber@massweb.org to register or for more information.