Employees enjoyed themselves at swanky venues in New York, London, Boston, Chicago, Southern California, Sydney and Wroclaw, Poland, according to attendees and Instagram photos.

Addressing reporters in the western city of Wroclaw, Mr Tusk criticised the government's plans, saying that without media access "democracy becomes dictatorship".

Television reports showed hundreds of women dressed in black protesting on the streets of major Polish cities including Katowice, Wroclaw, Poznan, Gdansk, Warsaw and Bialystok.