Frequently Asked Questions

Join us in person in Washington, DC, or virtually, for SITC's 36th Annual Meeting & Pre-Conference Programs (SITC 2021). For the latest information on travel requirements for Washington D.C., click here.

Registration Frequently Asked Questions

Can I register for both virtual and in-person programs? 

The SITC 2021 online registration platform will allow attendees to select from in-person and or virtual programs. If you have questions with your registration please email Showcare at or by calling 1-866-320-3203.

What is the difference between virtual and in-person registration? 

Registrants who select to attend Annual Meeting and/or Pre-Conference Programs in person can participate in the onsite meeting and will be granted access to the virtual enduring materials for the selected program(s). Attendees who participate in-person have access to onsite networking opportunities, poster hall and exhibit hall. The virtual meeting platform, including live-streamed content, virtual networking, ePoster hall and virtual exhibits, is available to all registrants for their selected program(s).

Registrants who select to attend the Annual Meeting and/or Pre-Conference Programs virtually will receive real-time access and enduring materials for their selected program(s) using a virtual meeting platform. Attendees who participate virtually will have access to live-streamed presentations with the ability to participate in live Q&A for program(s) for which they have registered. The virtual meeting platform includes virtual networking opportunities, an ePoster hall and virtual exhibits.

Additional programs purchased by in-person attendees can be virtual or in person.

When is the deadline to switch registration types? 

There is no deadline or fee to change a registration from virtual or in-person. Changes can be requested by emailing the official SITC registration vendor Showcare at, or they can be reached by phone at 1-866-320-3203.

Do I need to be fully vaccinated to attend SITC 2021 and the pre-conference programs? 

Yes. At SITC 2021, our goal is to have a safe and meaningful conference. To help manage the safety of all attending, proof of full vaccination for COVID-19 will be required for all in-person meeting attendees. We are currently assessing solutions for validating vaccination status and that information will be communicated soon.

We are excited and committed to offering a safe, in-person experience, and we will be adhering to the local safety guidelines and regulations. For the latest information on requirements for Washington D.C., click here.

For more information about the safety measures in place for in-person attendance, click here.

If you are unable to join us in person, we welcome and encourage you to attend the conference virtually.

More information can be found in the Vaccination Requirement section below. 

Do you offer group registrations or discounts?

No, SITC does not offer group registration discounts and all attendees must have their own individual registration. If someone would like to pay for multiple attendees, please contact the SITC Meetings Team at

Can I become a SITC Member or renew my dues within the registration process? 

Yes, you are able to join or renew within the registration process.

What is the registration cancellation policy?  

All cancellations must be received in writing. You may fax your cancellation to (414) 276-3349 or e-mail Requests must be submitted by Oct. 5, 2021. A $50 processing fee will be charged for all cancellations. No refunds will be granted if cancellation is received after Oct. 5, 2021. Special considerations will be given for health or family emergencies if requested in writing no later than Nov. 23, 2021.

How can I book a hotel room? 

All attendees must be registered in order to book housing. Attendees will be able to reserve their housing within the registration process.

What is the housing cancellation policy?  

New reservations will be accepted by the SITC housing bureau, Showcare Event Solutions, until Monday, Oct. 18, 2021. All changes and cancellations must be in writing via email to or by logging into your registration record by 5 p.m. EDT on Monday, Oct. 18, 2021. On a space-available basis, changes or cancellations made after Monday, Oct. 18, 2021, should be made directly with the hotel.

A credit card is required to process your reservation. Your credit card is required as a guarantee. Should you wish to pay by check, please plan to hand-carry the check to the hotel and provide it at check-in. Do not send any check deposits to Showcare, SITC or the hotel prior to arrival.

Cancellation Policy: Cancellations made after Oct. 18, 2021, will be charged a one-night room and tax cancellation fee. Any cancellations after Oct. 18, 2021, and no-shows, will forfeit the one-night room and tax deposit, and the rest of the stay will be cancelled.

SITC is not responsible for no-shows or early departure fees charged by the hotel or rooms resold due to non-arrival. Your specific reservation is being held for you in the inventory of rooms the hotel blocked for this meeting. SITC takes no responsibility should a room type not be available at check-in. Please visit the hotel's website for check-in and check-out times.

Will there be a poster hall?  

There will be a poster hall on site at the 36th Annual Meeting. The on-site poster hours are 7 a.m.–8:30 p.m. EST on Friday, Nov. 12, 2021, and from 7 a.m.–8:30 p.m. EST on Saturday, Nov. 13, 2021. As in typical years, poster presenters will be assigned designated times to present their posters in the poster hall during the poster receptions. Poster presenters are encouraged to attend the conference in person to engage with other attendees.

ePosters will also be available for all accepted abstracts. The ePoster Hall hours will be 7 a.m. EST on Friday, Nov. 12, 2021, through 5 p.m. EST on Sunday, Nov. 14, 2021. ePosters are available to all Annual Meeting attendees (both in-person attendees and virtual attendees).

What is the time zone for the meeting?  

Eastern Standard Time. All meeting times listed for SITC 2021 are in Eastern Standard Time.

What safety measures will be in place at the on-site meeting? 

SITC will adhere to local regulations and guidelines for social distancing, masks, and other safety protocols at the time of the meeting. Details will be provided to all attendees closer to the meeting.

Vaccination Requirement Frequently Asked Questions

Is there a chance that you might switch to a virtual only meeting? 

No. We are committed to offering an in person component. 

What happens if the government orders a shutdown or safe at home order or changes their guidelines or recommendations in any way? 

We will adhere to the national and local Washington, DC guidelines and regulations 

Will you be conducting onsite COVID testing? 

At this time, we do not have plans to conduct onsite testing.

Is COVID-19 testing required at any point during the

At this time, no. 

What do you mean by full vaccination? What if I’ve only had one dose of a two-dose vaccine? Will you require proof of a 3rd dose? 

We are following the CDC’s definition of fully vaccinated: 

  • 2 weeks after the second dose in a 2-dose series, such as the Pfizer-BioNTech or Moderna vaccines, or 
  • 2 weeks after a single-dose vaccine, such as Johnson & Johnson’s Janssen vaccine 

Will you require a 3rd booster? 


Will you accept proof of a negative COVID test in place of proof of vaccination? 


Will you accept proof of presence of COVID antibodies in place of proof of vaccination?  


Will the conference venues take attendee temperatures? 

The Convention Center security system will automatically scan the temperature of each individual entering the building. If an individual registers a fever, they will be escorted out of the building. The Marriott Marquis will not take attendee temperatures upon entry; however, all of their staff and vendors must have their temperatures taken each day they arrive at work before entering the building.

Can I change my registration type from in-person to virtual, or virtual to in-person? 

Yes, contact

Can I cancel my registration if I don’t plan to get vaccinated? 

Yes, contact

What if I have known exposure risk before coming? 

If you have tested positive for COVID-19 or have reason to believe you currently have COVID-19, you should not attend the conference, including if these conditions emerge while you are in Washington, DC. If you have reason to believe you have recently been exposed to COVID-19, please consult your physician to determine appropriate next steps. SITC encourages all individuals to follow applicable guidance from their care providers and relevant public health authorities. SITC is working to provide a safe and meaningful conference and trust that attendees, exhibitors, and SITC staff will do as well.

Will you be conducting contact tracing after the meeting? 

At this time we do not have plans to conduct contact tracing. 

Where can I get a COVID-19 test? 

Please refer to this website for a list of testing sites near SITC 2021.

SITC 2021 Virtual Site Frequently Asked Questions

Which browsers are supported by the SITC 2021 virtual platform? 

The virtual platform, OE Pro, will be supported in the following browsers: Chrome, Safari, Edge, and FireFox. Chrome is the preferred browser. Internet Explorer is no longer supported.

Can I logon to the virtual platform using my phone? 

The site is designed with a responsive interface that is mobile friendly however, it is recommended to connect via a laptop or desktop computer to enable all virtual meeting controls.

I’m having trouble connecting to the virtual platform. What can I do? 

There might be a problem with the web browser's cache and cookies.
Try logging in using an "incognito" feature (which usually ignores all your stored cache and cookies). If logging in via incognito works, you might need to clear your browser's cache and cookies to be able to log in from a normal window again.

Clear your Cache
You will need to enter your browser's privacy and security settings. Select “Browsing data" and “Cached images and files,” Last step will be to select “clear now.” You may also wish to follow up with your companies IT department for further assistance.

Additional tips on clearing cache by browser type:

On your computer, open Chrome.
At the top right, click More.
Click More tools. Clear browsing data.
At the top, choose a time range. To delete everything, select All time.
Next to "Cookies and other site data" and "Cached images and files," check the boxes.
Click Clear data.

Press the keys [Ctrl], [Shift] and [Del].
A new Window opens. Select the option "temporary services and files".
Confirm your selection by clicking on the "delete" button.

Click the menu button. and select Options.
Select the Privacy & Security panel.
In the Cookies and Site Data section, click Clear Data.
Remove the check mark in front of Cookies and Site Data.
With Cached Web Content check marked, click the Clear button.
Close the about: preferences page.

Open the Settings app.
Tap Safari.
Tap Clear History and Website Data. Tap "Clear History and Website Data" under the Safari tab in
the Settings app.
On the screen that pops up, choose Clear History and Data.

There might be a general problem with the web browser
It is possible that some settings on your web browser are causing the problem with logging in. If you are using an uncommon browser, it is also possible that it might not be supported. If you think there might be a problem with your browser, you can try logging in using another browser. If logging in with another browser works, then there are many possible reasons why the browser you normally use isn't currently working.

"JavaScript" and "Accept Cookies" should be enabled/allowed. These are the two more common issues for this type of problem. To make sure Google Chrome is correctly accepting cookies, you can go to "Settings > Privacy and Security > Site Settings > Cookies and site data". The option "Allow site to save and read cookie data" should be enabled. The options "Keep local data only until you quit your browser" and "Block third party cookies" should be disabled.

There might be a problem with blocking via the antivirus or corporate firewall policies
Antivirus and firewall software sometimes automatically block certain sites out of minor suspicions, and the web page following our login page might have been blocked causing you to be unable to login. If you think there might be a problem with your antivirus or firewall, you can try logging in using a different device. For example, if you are logging in from a desktop computer, try logging in using your mobile phone. If logging in using a different device works, this proves in general that the issue is due to something affecting the device that cannot login. In this case, you can add to your trusted websites on your antivirus and firewall settings to be able to login from your preferred device. This would need to be done for all forms of antivirus and firewall software on your computer. You may need to engage your IT help desk if this is a corporate IT policy.

Corporate IT settings
Some corporate IT settings will block websites. Please have your IT Security team whitelist the
following web addresses: