Uniqueness
The key element of all special events is their uniqueness: each one will be different. This is not to say that the same kind of event cannot be repeated many times, but that the participants, the surroundings, the audience, or any number of other variables will make the event unique. Even where we have looked at special events that are very frequent, such as weddings, all are different because different people are involved, the choice of location , the invited guests, the timing, and so on. The same is true of events that may have followed the same format for years and years. The ancient Olympic Games took place at four-year intervals for nearly 1,200 years, or put more simply, 300 repeat editions. But each was unique, because each had different athletes, different organizers and a different audience. The format also changed slowly over time. At the beginning, it was a religious festival for the Greek god Zeus, and only a 150-metre footrace, the 'stade', was run. At the end, there was no major religious aspect, but the athletics had become the activity, with 12 or so different sports in the games