RUMFORD — The River Valley Chamber is presenting the second of its Cabin Fever Reliever Series on Saturday, April 10, when The Maine Hysterical Society offers a comedy show at the Rumford Falls Auditorium. Doors open at 5 p.m., and the  show begins at 6. Tickets are $10 per person and are  United Insurance in Rumford, Community Concepts Transportation office in Rumford, Davis Florist in Rumford, The Canton Town Office, Riverside Realty and Erik Designs. F.M.I. Contact Cheryl Dickson at 369-9008 or the Chamber Office at 364-3241 for more information.