Amateur ham radio operators will man their machines for two consecutive days with one task in mind: Contact as many amateur or ham stations across the United States and Canada as possible in 24 hours. The event is part of the annual Field Day exercise for the Lanierland Amateur Radio Club. The activity will be from 2 p.m. June 27 to 2 p.m. June 28 in a building at Oakwood City Park on Railroad Street.