The event aimed to "review and showcase" the progress made before the Summer Olympics and Paralympics in just over three years time.

Organisers were also keen to take on board feedback to ensure the best possible conditions for athletes who compete in Tokyo.

Thirty-two people were involved in all from the 13 NOCs - representing Australia, Austria, Belgium, Brazil, Canada, Denmark, Finland, Ireland, Japan, Liechtenstein, Luxembourg, The Netherlands and New Zealand.

Meetings were held over three days, with representatives from areas including sport and transport.

The group also toured various venues, including the site of the Olympic Village, the Tokyo Metropolitan Gymnasium, Tokyo Stadium and Makuhari Messe.

Toru Kobayashi, head of NOC services and relations on the Tokyo 2020 Organising Committee, said: "Since last November, we have had individual NOC delegations visiting Tokyo, but it was the first time we welcomed delegations from multiple NOCs as a group. 

"Group visits were a regular and appreciated practice in Rio and London that we are now taking further. 

"We plan on organising four more NOC open days and two National Paralympic Committee open day events until 2019, in addition to individual visits."

Positive feedback was provided by the NOCs present, according to a Tokyo 2020 press release.

Luke Pellegrini, acting general manager for Games support and operations at the Australian Olympic Committee, said he was "pleasantly surprised".

"Something that was very impressive was the locations of the Olympic Village and the Olympic Stadium," he said.

"They are in downtown. 

"That is incredible and that will be a fantastic experience for our athletes, our officials, our fans.

"The location of the clusters of venues is fantastic. 

"That was really impressive on the tour, just how accessible Tokyo as a city is to this Games."

Gert Van Looy, Games Manager of the Belgium Olympic Committee, added: "It was a very good day. 

"We saw various competition and training sites, as well as the Olympic Village. 

"I have to say, it looks really good; it seems to be moving forward and there are great facilities."

Gustavo Harada represented Brazil after his country hosted the Rio 2016 Games in August and September.

"It was very interesting to get to know more details about the concept of the venue distribution here in Tokyo," he said.

"The Heritage Zone is very interesting with the 1964 venues from the past Olympic Games which are still very iconic. 

"And when you go back to the bay area, you can see the modern side of Japan, and this whole scenery by the water will be very interesting and will create a very positive climate for the athletes."