Tokyo City View is an observatory on the 52nd floor of Roppongi Hills. This is not really an illumination event, but they did put an artistic Christmas tree and some Christmas decorations inside. Also, from the observatory we could see the Tokyo Tower (and its special Christmas lighting) and the impressive Odaiba illumination.
Downstairs, there was a charming small German “Christmas market”. I didn’t buy any of the overpriced Christmas ornaments, but I got delicious hot wine and German sausage.