The Houston series mid September was big for both, we were trying to hold off the Rays and them their two division rivals. They averaged over 35k+ each game. I don't know how it really felt at the time.
August also had @Sea and @Tor where we did well in front of 40k+ fans several times. @NYY the 4th of July felt important at the time because we seemed to be unraveling. Anything earlier was probably too early to have a really important feel.
Anyway, we did well in all those series.
Houston is a bandwagon fanbase. I was at the 3rd game of that Sept series. There were plenty of empty seats. And the fans that did show up, couldn't be bothered to cheer. They were preoccupied with their cell phones and repeated trips to the concession stands. There were some guys near us that didn't know who their relievers were. I'm sure things will be different now that it's Oct. But if the Twins jump out in front early, Juicy Juice Park will be deathly quiet.