Thousands of Lego fans gather to build megacity in Finland A Vermeer oil painting, a theme park, and even President Trump all receive the Lego treatment as thousands of models made of the iconic plastic bricks go on show at Finland’s largest ever Lego convention. Organisers expect 15,000 enthusiasts to take part in the mass-building event this weekend, where participants will rifle through millions of plastic blocks to construct their own part of a Lego megacity .