Visa Information

Some visitors to Portugal may require a visa to enter the country. For information related to visa requirements to enter Portugal please check the relevant page of the Portuguese Ministry of Foreign Affairs https://vistos.mne.gov.pt/en/.

• If you are an author of an accepted paper, you may request an invitation letter immediately.
• Non-author attendees may request an invitation letter after registering for the conference through the registration page: no invitation letter will be issued until the registration has been completed, processed and paid in full.

Please contact pedro.adao@tecnico.ulisboa.pt to request an invitation letter and provide:

• your full name as it appears on your passport
• your affiliation
• address of your institution
• your institutional email address
• information on whether you have a paper accepted at CSF 2026. If so, please provide the title of the paper.
• your nationality

Invitation letters will be sent to to you within 4 working days of receiving your request.

Important notice: if you require an invitation letter and you are not verifiably affiliated with any academic institution (as an academic or a PhD student) please contact us before registering, as we want to be sure your application is genuine. If you don’t contact us beforehand and you register and we are not satisfied your registration is genuine, we will not write an invitation letter and will not refund the registration fees.

Please note that CSF 2026 will not refund attendees due to visa issues.