The Seneca Shipyard Days Festival is a yearly festival that celebrates Seneca's role in WW II as home to the "Shipyard on the Prairie" manufacturing LST's (Land Ship Tanks) for the war effort. During this period Seneca's population grew and we celebrate those that worked for the shipyards and helped with the war effort each year with historical eduation, Illinois LST Association, Seneca Historical Guild, Live bands, Taste of Seneca food booths, beer garden, and a carnival midway.