Great Exhibition 2010 Answered
The Great Exhibition of 2010 was held at London's La Scala nightclub, with over a thousand costumed attendees.
Have a look at the BBC video which won't embed - lots of the stuff we are familiar with through such luminaries as gmjhowe, but other, less traditional imagery as well, especially in some of the costumes.
There is also a slideshow here
My favourites are the actually-steam-powered piano, and the the thunderbuss.