Burt County communities are preparing for a patriotic weekend filled with parades, fireworks, music, games, food and hometown traditions as the nation marks the 250th anniversary of American independence. From Tekamah’s three-day Freedom Fest to Lyons’ carnival-filled weekend and Oakland’s Party in the Park, area families will have no shortage of opportunities to celebrate July 2-5. [Subhead] Lyons: Carnival, parade and fireworks fill holiday …