What if the topic of the lesson is "winter" - but there is no snow? What if the teacher tells you about throwing snowballs and building snowmen, a children's favourite pastime in Polish winter - but there is no snow?
If you can't make it, fake it!
A little improvisation goes a long way. If there is no real snow, as Izabella explains in the comment on the creative artwork made by the children of the Polish Language School, then some artificial snow is almost just as good.
So even in snow-free Tauranga, in the middle of New Zealand winter in August there was a snowman, snowballs - and even a small Mt Ruapehu, New Zealand's largest active volcano, on which there is snow, as Izabella points out. The only major difference were the temperatures and the fact that fake snowmen live longer than the real ones.