That's how it was explained to me. I originally thought it was just a day when a bunch of former Dapper Dan singers came back to the park, but then I was told that that wasn't the reason for it, that it was just pretty much an old style dress up day as if you were putting on your Sunday finest so to speak.While some of those pics seem to have taken it to a bit more of a steampunkish level, I think the original motivation was to return to the day when going to DLR was a reason to get dressed up and wear your good clothes.