Poland is a member of the European Union and participates in the Schengen Agreement, therefore citizens of countries within the Schengen Area and EU do not require visas. There are several other countries outside the EU and Schengen Area that do not require visa to Poland either due to the visa-free travel agreements. For more information please visit the web page of the Ministry of Foreign Affairs https://www.gov.pl/web/diplomacy/visas, and the web page of the European Commission https://home-affairs.ec.europa.eu/policies/schengen-borders-and-visa/visa-policy_en.
Participants that require visa to Poland should apply for it in the Polish Embassy or Polish Consulate located in their country. Please note that the travel document (Passport) should be valid for at least three months after the planned date for leaving the Schengen Area, contains at least two blank pages and was issued during the last ten years. Be aware that the visa application procedure in some cases may take a few weeks. If you need a confirmation letter, please contact the conference office firstname.lastname@example.org.