- Tokyo Stock Exchange to conduct year’s last trading session. The Nikkei average has added 19.1 percent since the start of 2019 and closed at 23,837.72 points on Friday, trading at its highest level in about 14 months.
- Annual Japan Record Awards to be announced.
- No major events.
- New Year’s Day.
- Japan-U.S. trade agreement and Japan-U.S. digital trade pact to take effect. The bilateral pact will cut tariffs on farm and industrial products, allowing U.S. farmers to be treated the same way as those from Australia, Canada and New Zealand, which are members of the Trans-Pacific Partnership free trade pact. The deal has been criticized by opposition parties and some businesses as being more advantageous to the United States.
- Government to start listing family name first when rendering Japanese names in the Roman alphabet on official documents. Ministries and agencies will adopt this order, breaking from the long tradition of reversing it for English and other languages, in line with a proposal greenlighted by the Cabinet in September.
- Seven-Eleven Japan to close about 50 stores in Tokyo in an experiment aimed at reviewing 24/7 operations amid a national labor crunch. Rival Lawson will close about 100 stores in Tokyo and 24 other prefectures.
- 2015 Paris agreement on climate change, successor to the 1997 Kyoto Protocol, takes force.
- Emperor Naruhito and Empress Masako to extend New Year’s greetings to well-wishers at the Imperial Palace, their first New Year’s outing since ascending the throne and launching the Reiwa Era on May 1. Emperor Emeritus Akihito’s final greeting appearance brought 154,800 well-wishers to the Imperial Palace, setting the record for the Heisei Era.
- Tokyo Metro to begin using new platform at Shibuya Station, concluding first major refurbishment to Ginza Line in 81 years.
- Travelers returning from year-end and New Year’s holidays overseas to peak at Narita International Airport in Chiba Prefecture.
- Toyosu fish market along Tokyo’s waterfront district to hold first auction of 2020.