Future and Past Events

Mark Your Calendars!

Don’t let Congress sneak up to you. Check out the dates and locations for the next four Congress events. Have you missed Congress within the past three years? We’ve got you covered. Previous Congress schedules and ePosters are also available for you to view.

Future Congress

ONS 45th Annual Congress
April 30–May 3, 2020
San Antonio, TX

ONS 46th Annual Congress
April 22–25, 2021
Washington, DC

ONS 47th Annual Congress
April 28–May 1, 2022
Anaheim, CA

ONS 48th Annual Congress
April 27–30, 2023
San Antonio, TX

Past Congress Schedules


ONS 43rd Annual Congress
May 17–20, 2018
Washington, DC
Access ePosters


ONS 42nd Annual Congress
May 4–7, 2017
Denver, CO
Access ePosters


ONS 41st Annual Congress
April 28–May 1, 2016
San Antonio, TX
Access ePosters