Here is some information for visiting karate enthusiasts provided by OCVB:
https://www.visitokinawa.jp/news/about-coronavirus-disease
Our center will be exceptionally closed March 2nd (Monday) to March 4th (Wednesday) as the Okinawa Karate Kaikan will be closed these days. Thank you for your understanding.
With the cancellation of the Okinawa Traditional Karate Demonstration scheduled to be held in Tokyo this Sunday, February 23, 2020, the Okinawa Prefecture will broadcast live an "Okinawa Karate Demonstration" from the Okinawa Karate Kaikan Special Dojo.
The Live broadcast will start from 14:00 on Sunday, February 23, 2020.
YouTube channel "Okinawa Karate Event"
https://www.youtube.com/channel/UC176Q7L3JfTmYBzDDPk2UhA
So far, preparation for the event were underway, but in light of the spread of the new coronavirus, the organizers have decided to cancel the event for the health and safety of the performers and the audience. The organizers are sorry for the inconvenience created, but hope enthusiasts will understand.
Source: Okinawa Prefecture Cultural Tourism Sports Department Karate Promotion Division
Since last year, the Okinawa Prefecture Karate promotion division has been holding sessions under the label "Okinawa Karate Academy". The research reports of the previous fiscal year's sessions have been published on the website of the division.
https://www.pref.okinawa.jp/site/bunka-sports/bunka/karate/okinawakarateacademy.html