Pavilions are made for pleasure. A traveling circus takes place under a big colorful pavilion or billowing tent. A wedding might take place under a pavilion or freestanding decorative building in a garden.
The word pavilion comes from the Latin papilionem meaning "tent" or literally "butterfly." Think of the sweeping beautiful wings of a butterfly and how they sort of resemble the folds of a tent. In the eighteenth century, pavilions were popular in Europe. Wealthy people would build these small temple-like buildings where they could go to reflect and find calm. Today, the word is more commonly used for big tents or outdoor spaces where events are held.