Charlie Day, known for his role in "It's Always Sunny in Philadelphia," teamed up with Portugal. The Man at the Hollywood Bowl to perform the iconic song "Dayman" from the show. The song originally appeared in season 3, and a full musical episode based on it was created in season 4. This performance marked the first time Day joined Portugal. The Man on stage. The article also mentions that the song has been performed by the band many times since 2013.