The White Stripes Play A Secret Show A Winnipeg Transit Bus, Help Its Passengers See God
– stereogum

And from the comments section:

In fact they’ve been doing these free impromptu gigs throughout the Canadian tour.

http://www.youtube.com/watch?v=_mnwfxtvYd4

And then they “performed” with a busker:
http://www.youtube.com/watch?v=3TuGU1imT4I

Bowling Alley:
http://www.youtube.com/watch?v=oF_c7Pi_TKc

Hope Mission Shelter:
http://www.youtube.com/watch?v=nbQCwMtTnCI

Whitehorse Park:
http://www.youtube.com/watch?v=wE-F0mhqlcc

Youth Center (Mobile Classroom)
http://www.youtube.com/watch?v=0yRUEjI6vH8