RUMFORD – The River Valley Expo 2009 committee will hold a kickoff meeting for potential exhibitors from 5 to 7 p.m. March 31 at Black Mountain of Maine. The meeting will focus on early registration with benefits and a preshow workshop. Exhibitors for the expo, scheduled for Sept. 18-19, will be able to register for booth space. By doing early registration, exhibitors will be eligible for drawings of various prizes.