It's currently a bracing 39 degrees Fahrenheit in Budapest, and crystal clear, but never mind! Grab your bathing suit and drop on over to the Szechenyi, where Europe's largest and arguably finest thermal bath hosts its annual year's end dance party, staged by the veteran producer Laszlo Laki. And don't fret the "air temperature," as the Budapesters routinely scoff at it: The water in the outdoor pools at the Szechenyi rocks steady at 81-100 F, depending upon which pool you plunk down in. Kick back with a drink, or frug the night away, but in any case, relax! The air temperature is not a bother. Here's how it happened and why you should, if you're within shouting distance of Budapest, go: Laki, Budapest's bath-party czar, had been busily running his firm of light-show creatives, Cinetrip, producing concerts and other events in the early Nineties, when he managed to persuade the managers of a few of Budapest's more famous baths, the Rudas a...