From the late seventh century, when the festivals and offerings of Ise Shrine became more formalised, a number of annual events have been performed at both Naikū and Gekū. The Tsukinamisai, which was held in June and December, as well as the Kannamesai Festival in September, were the only three offerings performed by the Saiō, an imperial princess who served as high priestess of the shrine until the 14th century. These offerings are based on the cycle of the agricultural year and are still performed today.