Frequently Asked Questions



Submission, registration and payment

The submission of manuscripts and the review process in the conference is an exclusively online process. Visit https://cms.gnest.org/user/register and create an account. Then, after logging in to the website, you will be able to submit your abstract after choosing the "submit new full paper".

Payments for the registration fees for CEST2021 are processed through the eCommerce service provided by Alpha Bank Greece. Through Alpha Bank eCommerce we are accepting Credit card payments and bank transfers. Payment confirmation is sent by e-mail to the emails address provided by the Customer soon after acceptance of the payment (by credit card) has been processed by the bank. A receipt or invoice will be issued after your payment and will be delivered to the e-mail address provided during the payment within a week. Please keep in mind that online registration is mandatory in order for your payment to be confirmed and valid.

More info can be found at https://www.cest2021.gnest.org/online-payment

Notice of cancellation must be prepared in writing and sent by email to cest@gnest.org. CEST2021 will refund fees as soon as possible and no later than one (1) month after the conference has concluded.

Cancellations received by June 30, 2021 at the latest: Full refund of fees paid less an administrative fee of 10%.

Cancellations received by July 31, 2021 at the latest: 50% refund of fees paid.

Cancellations received after July 31, 2021: No refund can be made.

Substitution Policy: Registrants may send a substitute in their place instead of requesting a refund.

CEST2021 is not responsible for travel expenses or penalties under any circumstances. In the event of a cancellation by CEST2021 Organizing Committee, all registrants will receive a full refund of any registration fees paid.

Yes, you can change the name until 25 July 2021.

Any change request needs to be addressed at the conference secretariat by email at cest@gnest.org. Please refer to the paper id or invoice/receipt number in every communication.

Yes. If you require an invoice, please select the option “INVOICE” while registering. Once the option is selected, you will be asked to fill in the billing details of the company/institution the invoice should be issued to.

You can submit your registration without paying, but in this case, your registration fees will be subject to changes according to the respective deadlines. Please note that a registration will only be considered valid when fully paid.

You can submit your registration without paying, but in this case, your registration fees will be subject to changes according to the respective deadlines. Please note that a registration will only be considered valid when fully paid.

Onsite registration will be available with the relevant period fee in the conference secretariat during the conference days. However, it is mostly suggested for conference attendants and not authors/presenters. To include your paper in the program and the proceedings, registration and payment must be completed.

Registration fees include conference material, entrance to CEST welcome party, beverages, coffee breaks, lunch breaks and the official conference dinner.

Yes. A detailed confirmation letter and invoice/receipt will be sent to you via email as soon upon submission of your details in the services online form.

Papers and presentations

You only have to attend if you are the presenting author in an accepted paper.

Therefore, we encourage you to only submit your paper presuming you intend to attend the conference and present it.

CEST2021 Organizing Committee is watching closely the on-going development of the global spread of COVID-19, ensuring that all the latest guidelines are strictly followed. We wish to be able to organize a physical event, given the fact that the current situation will improve until September 2021. We have already decided that CEST2021 will be held as a hybrid event, so the opportunity of a virtual presentation will be provided to the participants.

All the authors will be notified of the final decision by 30 April 2021.

You can send us an email at cest@gnest.org with the exact corrections you wish to make, or the revised manuscript with the changes tracked on it.

Please visit the relevant section of the website and follow instructions provided to submit your paper https://www.cest2021.gnest.org/guidelines-to-authors .

Invitation Letters

Visa regulations depend on your nationality and country of origin. We suggest that you contact your local Greek Embassy or Consulate for full and official instructions on the specific Visa regulations and application procedures that apply to you. For more detailed information please visit the Greek Ministry of Foreign Affairs: www.mfa.gr

Invitation letters are being sent only to authors whose paper is accepted for oral/poster presentation in CEST2021. Please keep in mind that the invitation letter does not ensure that a VISA for travelling to Greece will be issued.


You can download an invitation letter from Conference Submission platform. After login to your account, you have to click on “My invitation letters” on the left-side menu. Please keep in mind that not all authors are eligible for an invitation letter as being an author of the paper does not make you eligible for receiving an invitation. To make an author eligible for an invitation letter, please assign him as a "Presenting author" or a "Participant" through the edit screen of your paper. If you do not have access to do it, please contact us.