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August 11, 2021 — ASTRO announced that it is facilitating measures that seek to ensure optimal health and sanitary conditions in all environments where in-person interactions take place during the 2021 ASTRO Annual Meeting. To assist in ensuring the safety of all attendees and exhibitors ASTRO will be requiring all attendees and exhibit booth personnel to attest that they have been fully vaccinated against COVID-19 prior to their attendance. In cases where a medical condition does not allow for vaccination, a negative COVID-19 test within 72 hours of arrival to the convention center will be required.
In addition, all attendees and exhibitor booth personnel will be required to wear a mask while in the convention center, Exhibit Hall and ASTRO shuttle buses, except when eating or presenting. ASTRO is working with the city of Chicago and will follow or exceed all recommended Centers for Disease Control and Prevention (CDC) safety protocols and will comply with all federal, state and city regulations. ASTRO will continue to closely monitor all guidelines and regulations and will update these safety protocols as appropriate. Attendees, staff, exhibitors, exhibitor appointed contractors, vendors and members of the labor force should stay home if they have tested positive for COVID-19, are waiting for their COVID-19 test results, have COVID-19 symptoms, or if they have been in close contact with a person who has tested positive for or who has symptoms of COVID-19.
ASTRO will continue to monitor federal, state and local recommendations and will update these protocols and measures as appropriate. Updates can be found at: www.astro.org/safety
October 16, 2026 
