I doubt there is anything specific for Pentecost in Lisbon.
Searching for events in Lisbon around that date on multiple websites was not successful. The tourism website for Lisbon did not return any match for that day, neither Lonely Planet. Typing “Pentecostes Lisboa” in a search engine ending up pointing to a vigil of Pentecost so if you are religious you should be able to find a church with a specific mass.
Regarding Pentecost Monday, unlike said on some Wikipedia page, it does not seem to be a public holiday in Portugal. Multiple websites, including Wikipedia, do not list it as a public holiday.
However, it seems a few towns have a public holiday on the Monday or Tuesday after Pentecost, but mostly in the North of the country, as listed on the portuguese Wikipedia page for public holidays.
Credit:stackoverflow.com‘
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