And he was joined by at least 20,000 other Cubs fans whom he did not personally invite.

In a season when the hugely popular Cubs have established themselves as the best team in baseball, are running away with the National League Central and are poised to make a run at ending a 108-year championship drought, their fans are showing up in force wherever they play, but nowhere more than in Milwaukee.

Chicago is so close to Milwaukee — about a 90-minute drive straight up Interstate 94 — that Cubs fans regularly follow their team here. But because the Cubs are doing exceptionally well and Monday’s game was an inviting Labor Day matinee, the throng that showed up from Chicago was bigger than usual.

In fact, it was large enough to sell out the stadium, as 43,622 tickets were sold for the game. The blue-shirted Cubs fans outnumbered those rooting for Milwaukee, and they had plenty to yell about as — what else? — their team trounced the Brewers, 7-2, to move to 89-48 on the season. With 25 games left to play, the Cubs seem almost certain to win at least 100 games, something they have not done since 1935, when — of course — they lost the World Series to the Detroit Tigers.

On Monday, the Cubs faithful roared in the sixth when Jorge Soler’s bloop single to left brought home the tying run, wildly celebrated pinch-hitter Chris Coghlan’s go-ahead single in the seventh, and chanted “M.V.P!” for Kris Bryant in the four-run Chicago eighth. The Brewers star Ryan Braun even heard boos in the ninth inning before homering to left.