It's that time of year again - the day when literally every single person you encounter on the street will be sporting a red heart sticker (and those who don't will be endlessly harassed by unnaturally cheerful people with collection boxes). What are they for? They're proof that you donated to the Christmas Charity to purchase medical equipment for children and seniors in need. Since it began in 1993, the Great Orchestra of Christmas Charity has raised literally hundreds of millions of dollars for the Polish health system. To support the effort dozens of entertainers will be performing for free around the Old Town all day. Each year since its inception the celebrations have concluded with a massive fireworks display, but this year organisers have said that the 20:00 finale will take on a different form (lasers? lights?). Coordinated by volunteers in every city and small town across the entire country, this is a worthy cause, so don't be a humbug.