I guess it's some sort of advertisement for the contractor. Then about a week or so after that (depending on the owners of course), they can start moving their stuff to the new house and they can start living there.
Something like this doesn't exist in Indonesia, so it was very interesting for me to find out about it. Housewarming parties are typical in both countries (Indonesia and Finland), though I haven't actually been in any either here or in Indo LOL!!! But at least I know that that kind of party exists.
How about in your country? Is this kind of house exhibition customary there, too?
Seriously this warm weather is puzzling me. It's been over 0'C during the days for the past two days and the snow has been melting rapidly despite the fact that there's been no sun. Feels so weird that spring may just come much earlier this year. Oh well...