Visa requirements & letter of invitation

General information

Visitors from outside the European Union (EU) should check whether or not a visa is required. In most cases a valid passport will be sufficient. Moreover, visitors from central and eastern Europe should check whether or not special health insurance is required for receiving a visa. To find out whether you need a visa to visit Portugal, see the Schengen Visa Information website or check with your local Portuguese Embassy or other diplomatic representative before you travel. The rules change regularly, so you should check you have the most up to date information for your trip. All insurance and visa costs must be borne by the participant.

Letter of invitation

The deadline for requesting a letter of invitation is 8 July 2022.


Participants that require an official letter of invitation in order to obtain a visa, to raise travel funds or for administrative purposes should apply for this invitation by at least 8 weeks prior to the conference at the very latest. The following information is needed:

  • Abstract ID
  • Address of the applicant
  • Passport number
  • Date of birth (dd/mm/yyyy)
  • Indication if an original copy is needed in addition to the pdf file.

Please note that invitation letters will only be issued to participants who either have a paid conference registration or an accepted abstract. Therefore, please submit your request for an invitation letter only after having received your letter of acceptance notification or after having paid your conference registration.

It should be understood, that such an invitation is not a commitment on the part of the organizers to provide financial support and that the organizers can only issue an invitation which includes the period of the conference plus the Saturdays and Sundays directly before and after the conference, respectively.

The letter of invitation will be sent by email; if requested, also as an original copy by airmail (standard letter without tracking number). We would like to point out that invitation letters are only sent to the address indicated by the applicant. The provided name and address must exactly match that on your passport. The organizers will NOT send invitation letters to embassies, neither by fax/email nor by separate post. The applicants are responsible to take care of their own visa application and need to directly contact the respective embassy. Please consider that the invitation letter is a standard letter which will not be modified individually. You are responsible for contacting the relevant Portuguese Embassy or Consulate and for finding out what kind of visa you require. Please allow sufficient time for your letter to be processed and the local Embassy to process your visa.