Symposium 2018, Four Seasons Resort & Club Dallas at Las Colinas This is your early invitation to join us May 1 to 4, in Dallas, TX, for Symposium 2018, at the Four Seasons Resort & Club Dallas at Las Colinas. This is a repeat Symposium at this beautiful property, so we’re expecting another great event! Please keep an eye on this page for more information coming late 2017. We look forward to seeing you at Symposium 2018!