Ok here's the deal with accessibility, It's a bit odd but the building does have a wheelchair accessible bathroom in the basement, and you can get to it via a ramp from outside, around back. However the hall where the bazaar is, is on the main floor which is up about 6 outdoor steps, it has a strong metal railing. The aisles between rows at the bazaar will be plenty wide for manuvering, and there are lots of chairs available if you need to take a break.
If you have any questions please send me an email - firstname.lastname@example.org
hope to see you there!