The following are the future dates for the Esri User Conference:
July 9-13, 2018
July 8-12, 2019
July 13-16, 2020
July 12-15, 2021
July 11-15, 2022
You can see future UC dates at the following web page. Scroll to the very bottom. https://www.esri.com/en-us/about/events/uc/registration
Thanks Ben, looks like the dates in this document match those over on the registration page you linked to at www.esri.com so the dates here are still correct which is good to know!