Check out NME's website for an article about the Foxboro Hot Tubs gig in London, which was November 1st. Here's a snippet of what NME had to say:

As the night wore on, the band continued to goof around with Dirnt telling the audience: "The only reason you're here is you didn't go to church yesterday."

Rolling Stone also had a few things to say about the Foxboro Hot Tubs here. Enjoy a quote from the review:

Keeping with the trick-or-treat spirit, after exhausting that initial cavalcade of songs, the band next performed the title song "Stop, Drop and Roll" four more times consecutively, claiming each time they'd played it better than before.

Relevant Articles:
Green Day play secret Foxboro Hot Tubs gig in London - NME
Green Day Revive Foxboro Hot Tubs for Surprise London Show - Rolling Stone