On this day 15 years ago (12 May 2009), Green Day played the 700-capacity Le Trabendo in Paris. That was a very tiny show considering how huge they were then.
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There was also this press conference in Paris, although I'm not sure if it was on May 12th or the day before/after.
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26 years ago (1998), they played in Lewiston, ME, on the Nimrod Tour. These photos are from a radio interview that day.
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And 32 years ago (1992), they played the Ritz Diner in Edmonton, Canada on the Kerplunk Tour.
"The first time Green Day came to Edmonton they played 2 shows; first show was Sunday matinee/all ages at the Bronx and an acquaintance booked this show for a couple days later. This person didn't have the best reputation, so I helped him with shows to ensure that bands got paid and that flyers were put up. When the band arrived they weren't happy about the show being 18+ and that the bar was a strip club on the days we didn't have shows. They were cool to me about the situation and an all ages show was quickly put together at the Ritz Diner, just down the road. The roadie for GD on this tour was Aaron Cometbus, and I was quite excited to meet him and buy a zine. ...The Ritz show was so tiny, not a lot of people." — Shaun Cowan