Make sure to check out if you need a Schengen visa to enter Portugal. The most common one is up to 90 days for tourism or business purposes:
Portugal Ministry of Foreign Affairs
If you need an invitation letter to attend DeepLearn 2022 Spring, please provide the following information to david@irdta.eu:
- Institution/Organization address:
The letter of invitation can be issued only after the participant has registered and the fees have been received.