Restoration of Sovereignty Day in Japan
Restoration of Sovereignty Day in Japan is held on April 28. 主権回復の日 Shuken kaifuku no hi - It marks the end of the American occupation of Japan on 28 April 1952. This event in the third decade of the month April is annual. 
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Japan has been captivating travellers since it first opened up to international trade in 1853. While its many traditions and cultural landmarks persist, Japan is also one of the leading economic and technological centres of the world. Kongo Gumi is the oldest operating business in the world, established in 578. It specialises in the construction of temples and shrines in Japan. Tsukiji Fish Market in Tokyo was the largest wholesale fish and seafood market in the world, famous for its tuna auctions.
Hailed as the solo dining capital of the world- Japan’s shrinking population combined with an increase of single-person households has meant requesting a table for one quite the norm.
With 5 million vending machines- Japan has the highest density in the world. Batteries, ramen, sake, umbrellas. flowers- you name it and the vending machines probably stock it.
If you check your zipper, chances are, it will say YKK on it, which stands for Yoshida Kogyo Kabushikikaisha. Founded in Tokyo in 1934, it is estimated that 7 billion zippers are produced by this manufacturer each year.
Source: roughguides.com
Similar holidays and events, festivals and interesting facts
Game Designers' Day on April 27
Shōwa Day in Japan on April 29 (昭和の日 is celebrated in Japan to commemorate the birth date of Emperor Showa or Hirohito, the emperor of pre and post-World war II);
Constitution Memorial Day in Japan on May 3
Garbage Day in Japan on May 3 (Gomi No Hi);
Greenery Day in Japan on May 4 (みどりの日 - Until 1988, April 29 was celebrated as the birthday of Emperor Showa. It was decided to keep this day a holiday even after his passing away in January 1989 and to name it Greenery Day because of the late Emperor's love of nature. In 2007, April 29 became Showa Day, and Greenery Day was moved to May 4);
Buddha's Birthday on May 5 (Buddhist festival - 灌仏会 - Matsuri, which is held in Japan. It is also referred to as Hana Matsuri, "Flower Festival");
Children's Day in Japan and South Korea on May 5 (Tango no sekku, also known as Ayame no hi )