The Couchsurfing "Christmas Party" will be this Wednesday, December 18 in Stare Miasto. In theory, I'm the host of this event. I'll be there from 8:10 pm. If this turns out to be just 60 people drinking in a pub like the usual Wednesday Couchsurfing meeting, the host and Christmas may be irrelevant. Anyway...
Most people at Couchsurfing events speak English well. There will be grzaniec for 7 zloties. Also, this pub serves food until about 9 pm. There will be a Christmas-themed game with prizes for anyone who wants to be in a game. And there is a prize for the best Christmas-themed costume. If you want to be in the game, you will need a pen, and to have a chance of winning, you will have to meet everyone else in the game.
This event will be at Alter Ego at Florianska 13. The entrance looks like a log cabin or chalet, but it's at the back of a courtyard so you can't really see it from the street. It's less than a block from the rynek between Trattoria Prima and Diverse. There is a smoking area in the cellar.
Just before that, I will host the English Language Club as I do every Wednesday from 6 to 8 pm. We are meeting temporarily at Budda Bar at Rynek Glowny 6 until renovations are finished at the KIK church building where we usually meet. This meeting is for fluent English-speakers. Couchsurfing is not so language-specific.