The following is a chronology of major events related to the Tokyo Olympics, due to open July 23.
Sept. 7, 2013 -- Tokyo wins bid to host 2020 Summer Games.
Jan. 24, 2014 -- Tokyo Olympic organizing committee set up.
Oct. 16, 2019 -- International Olympic Committee announces plan to relocate marathon and race walking events to Sapporo due to heat concerns.
Jan. 30, 2020 -- World Health Organization declares coronavirus outbreak global health emergency.
Feb. 4 -- Tokyo Olympic organizing body sets up task force to deal with coronavirus outbreak.
March 11 -- WHO calls coronavirus outbreak "pandemic."
March 12 -- Olympic flame-lighting ceremony held at site of ancient Olympics in Greece without spectators.
March 20 -- Olympic flame arrives in Japan.
March 24 -- Then Japanese Prime Minister Shinzo Abe, IOC chief Thomas Bach agree to delay Tokyo Olympics and Paralympics by one year.
March 30 -- IOC, Japanese organizers agree to hold Olympics from July 23 to Aug. 8, 2021.
March 20, 2021 -- Organizers decide to stage Tokyo Olympics and Paralympics without overseas spectators due to pandemic.
March 22 -- Tokyo Olympic organizing committee says most volunteers from overseas will not be allowed to enter Japan.
March 25 -- Tokyo Olympic torch relay begins in Fukushima Prefecture.
May 28 -- Prime Minister Yoshihide Suga says he will consider allowing spectators at venues.
June 16 -- Japanese government decides to allow up to 10,000 spectators at large events.
June 17 -- Japanese government decides to end state of emergency in Tokyo.
June 18 -- Japan's top COVID-19 adviser says staging Tokyo Olympics without spectators "desirable."
June 21 -- Organizers set Tokyo Olympic spectator cap at 10,000 per venue.
July 8 -- Organizers agree to hold Olympics without spectators in and around Tokyo following Japanese government's decision to declare state of emergency.
July 23 -- Tokyo Olympics opens.