In response to the relaxation of border measures from October 4, 10, the border measures page of the Japan National Tourism Organization (JNTO) MICE website has been updated. Please see below for details.
 

Immigration information required when holding MICE in Japan (Japanese)
https://mice.jnto.go.jp/practical-coronavirus-information/

COVID-19 Travel information for business travelers
https://www.japanmeetings.org/plan-your-event/coronavirus-travel-information/

In addition, we have compiled a list of frequently asked questions within JNTO, so please also refer to the following.
 

[Frequently asked questions]
(1) Will the red/blue/yellow classification of departure countries/regions remain?
・The red, blue, and yellow divisions will disappear.
(2) Is vaccination proof/negative proof still required?
・For all returnees/entering the country, vaccines designated by the Japanese government (International Health Organization
Vaccination certificate (10 doses) or departure from Japan (expanded from October 11th to vaccines on the emergency use list)
Proof of a negative test taken within the previous 72 hours is required.
*Latest list of vaccines designated by the Japanese government (Ministry of Health, Labor and Welfare website)
day:https://www.mhlw.go.jp/stf/seisakunitsuite/bunya/border_vaccine.html
Britain:https://www.mhlw.go.jp/stf/covid-19/border_vaccine.html
(3) Is the acceptance supervisor/ERFS still necessary?
・Not required (however, for countries/regions that require a visa, you will need to invite the same people as before the coronavirus.
For details, please check the Ministry of Foreign Affairs website or diplomatic missions overseas).
(4) Does the visa exemption measure apply to the relevant countries and regions before the coronavirus?
・Applicable to applicable countries and regions before the coronavirus outbreak.
(5) How will the Japan Tourism Agency's ``Package Tour Guidelines'' be handled?
・Guidelines will be abolished from October 10th.
 

Please check announcements from relevant ministries and agencies for the latest information.