I visited Gdansk in December, 2015
We could hear Norwegian being spoken everywhere, all around us, the whole weekend. If we were in the city center we were surrounded by Norwegians. There seemed to be more Norwegians than Poles in Gdansk. A Norwegian invasion.
Flights from Norway to Poland are very cheap at the moment. I paid 500 kroner (£50) for a round trip Trondheim-Gdansk. Add the cheap prices in Poland and visiting Gdansk for a weekend can actually save you money.