This article is a travel topic
Tickets went on sale in spring 2019. Residents of Japan only can buy tickets from the Tokyo 2020 official websites. All overseas residents are requested to purchase tickets via their country's authorised ticket resellers.
Average price for a ticket is around 8,000 yen (70 USD), cheapest tickets are 2,300 yen. The most expensive tickets are for the Opening Ceremony and Closing Ceremony (230,000 yen), athletics are the most expensive sport events (the men's 100 meters final ticket is 130,000 yen).
General information can be found on Tokyo article. However, most travellers will arrive by plane at Tokyo Haneda airport. Some others may arrive at Narita airport which is about 70kms northeast of Tokyo.
Seven venues are located within the central area of Tokyo. Some of these were originally built for the 1964 Olympic Games.
Other venues are located in the Bay Area of Tokyo, especially on Ariaka, Odaiba and artificial islands.
There are 339 events scheduled in 33 sports and 50 disciplines. There will be five new sports that will be introduced. These new sports are baseball/softball, karate, sport climbing, surfing, and skateboarding. There will also be fifteen new events within existing sports: Madison cycling, freestyle BMX, and 3x3 basketball plus other mixed events in other sports.