The term 'OCCASION AT STONEHENGE' refers to the equinox, which is an astronomical event that occurs twice a year when the sun is directly above the equator. During this time, the day and night are of equal length. Stonehenge is a prehistoric monument located in Wiltshire, England, and it is believed that it was built to mark the equinoxes. Therefore, an 'OCCASION AT STONEHENGE' is a celebration of the equinox at the ancient monument.