Usually, when a band releases a hit song big enough to crack 300 million plays on Spotify, an appearance on “Ellen,” and — holy among holies — a remix by Weird Al Yankovic, its days of playing barrooms are over. Alt-rock outfit Portugal The Man has gleefully made itself an exception. The Portland-via-Alaska five-piece came through Denver on March 16 to play Blake Street Tavern and the Museum of Contemporary Art, a pair of venues that, size-wise, would be modest for some local bands. First up that day: a 9:30 a.m.