According to Wikipedia, the last time the Green Bay Packers have had a game that did not sell out was on the 22nd of November in 1959.
Yes I realize that Wikipedia might not be the most credible site, so I spent close to an hour culling through various websites in an attempt to find if this was the correct date.
I was met with interesting results. In the various sites I checked, and different articles I read, I found that no one had an exact date. There wasn’t a single site that held the same date as Wikipedia, as the last Packers non-sellout. In fact, I repeatedly read articles from writers saying that they, too, could not find the exact date.
According to thesportmarket.biz, the Packers had a streak of 374 consecutive sellouts as of March 2012, so add the eight home games of the 2012 season and the five home games of this season, and the streak comes to 387.
While this may be an impressive streak, what may be more impressive is the fact that the Packers have been selling out home games for so long that no one remembers the last time they didn’t have a sellout game.