So, it's a two and a half hour online event. The included content is explained as the following.
- A discussion with the developers of the DFA 21mm Ltd.
- Further evolution of the K-3 III, including firmware updates and "other"
- Future Pentax products
- Q&A based on questions submitted by attendees on the application form
- Some kind of closing video
They express some regret that this can't be an in-person event. In the past they have done this kind of event at their locations in Japan. Instead they still have to do this online because of the pandemic situation. It's actually not that bad at all in Tokyo now, but at the time they were planning this, online probably seemed safer.
So I don't think this is intended for international audiences, and I don't expect a lot of English language support. They also mention that they are looking forward to welcoming people from "around the country", which makes me think you might need a Japanese address to attend.
Even if it is not easy or possible to attend from outside Japan, I expect we will see some information on the website released at the same time.