Today it's worth paying a visit to the center of Helsinki. There are lots of Christmas events going around town.
Visit e.g. the marrimekko Christmas stage on Mikonkatu to watch one of their Christmas shows. Performances will be on stage the whole day through.
Or come to Kamppi Kaupakeskus and enjoy live music from Lenni-Kalle Taipala at 14:20 and 15:10. At 14:00 a 500 people choir will sing Christmas songs. And of course don't miss the fireworks at 16:30. To see the full program for today and tomorrow at Kamppi visit their website.
Also the Christmas Bazaar mentioned on HelsinkiIn yesterday will be open the whole day through.
Have a great weekend!