In 1811, a show was added to promote Bavarian agriculture. In 1813, the festival was canceled due to the involvement of Bavaria in the Napoleonic Wars, after which the Oktoberfest grew from year to year. The horse races were accompanied by tree climbing, bowling alleys, and swings and other attractions. In 1818, carnival booths appeared; the main prizes awarded were of silver, porcelain, and jewelry. The city fathers assumed responsibility for festival management in 1819, and it was decided that Oktoberfest become an annual event. In 1832, the date was moved some weeks later, as a Greek delegation came. It inspired them for the Zappas Olympics which became in 1896 the modern Olympic Games. Later, the Oktoberfest was lengthened and the date pushed forward because days are longer and warmer at the end of September. The horse race continued until 1960, and the agricultural show still exists today and is held every four years in the southern part of the festival grounds.