Field Day has morphed into many variants from it's original days, and seems to be more of a contesting event in many areas (example: a club in this area is trying to ensure that all hf rigs are the same model, to eliminate the learning curve of someone moving to another table and having to figure out a different radio, thus keeping them in contention for the most points). Other groups are closer to the concept of learning how to setup radios and antennas with an emergency power source (battery, gas powered generator, solar panels, etc.), but whatever you're doing on Field Day, have fun doing it!