The last Night Pedal Cruising ride of 2015 sure looks like one festive affair: bikers in Santa costumes will be gathering at the UN University Farmers' Market, from where the red-and-white bunch will set out on a leisurely cruise around town on their colourfully decorated bicycles. Pull on your Father Christmas outfit, slap some lights on your ride and bring a whole bunch of holiday cheer – the ride meets at 5pm and starts 30 minutes later. The pace should be suitable for all participants, so you'll have no excuse not to join in and see Tokyo's winter illuminations from a different perspective.
For more info in English, see this page on Tokyo By Bike.