Last week in Finland, snow descended on the capital, and with it came a flurry of start-ups, scale-ups, venture capitalists, angel investors and corporate enterprises, all in town to do business at Slush. Who wants to visit Helsinki in late November? Perhaps only the brave? That’s exactly what the organisers of one of Europe’s most popular start-up and tech conferences are banking on. Whether it is marketing, or a masterful plan to sort the wheat from the chaff, it works, and for a few short days, 13,000 attendees trudge through the snow and slush to descend the steps into Messukeskus,…