I'm sure it's far too late to register for this event this year, since it starts in two days, but it's an annual event so people might be interested in attending next year. The Okinanwan Prefectural Government and the Okinawa Dento Karate-do Shinkokai (Society for the Promotion of Traditional Okinawan Karate) sponsors an annual multi-style week-long seminar in Naha. The seminar is organized in four parallel tracks (Shorin-ryu, Uechi-ryu, Goju-ryu, and Kobudo), with a different style/organization teaching each track on a given day (i.e., the Goju-ryu track is Meibukan one day, Jundokan the next, etc, etc). The tracks are taught by the most senior instructors (mostly 9th and 10th Dan) in each organization. It's open to any karate practitioner anywhere and the seminar itself is ridiculously inexpensive (20,000 yen for the week or less than 200 US dollars). You can stay in one track, or try a different track each day. Total attendance is limited to 150 participants, so the seminars are small and there's a lot of individualized instruction. If you've ever wanted to visit the motherland of karate and see how it's done there (by the best of the best, no less), this is a golden opportunity (assuming you can manage the airfare)
Informattion on this year's seminar (this is where next year's seminar will be announced): https://karate-event.jp/en/seminar/
Here's this year's program. Next year should be similar: https://karate-event.jp/en/seminar/program/
I have no connection whatsoever with this event. Just posting it because I think it might be of general interest.