Gate City Plaza in Osaki, Shinagawa Ward, has a free Santa Village until Christmas Day. The Atrium is decorated as a Santa grotto and village. It is free and open to the public daily from 7am to midnight. For the month of December, they also have a special area set up to write your wishes to Santa Claus and put them in a box for him to pick up.
On the 23rd, Santa Claus will personally visit Gate City to pick up the letters. He plans to hang around for most of the day so there will be an opportunity to see him. From 1pm and again from 4pm they will have a family group event with Santa. Separate to that they will have a photo with Santa event at 11am to 1pm and 3pm to 4.30pm. However, if you want to get your photo with Santa at the allocated times, you must request a ticket at the delivery corner of the Atrium. Tickets are limited, so first come, first served. There is also a family singing event in the Atrium that day at noon and 3pm.
Further, information is available in Japanese on the website: https://www.gatecity.jp/plaza/event/
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