unfortunately I couldn't attend Gurupalooza. Had a few other conference calls yesterday and then it was time for the family.
Thanks for mentioning Domino JNA! Do you know who asked about appending a JPG file attachment from richtext item A as embedded image in a richtext item B? Would be happy to help, e.g. in the Domino JNA slack chat on xpages.slack.com.
Using Domino JNA, it's not a big deal, it can read binary content from $file without the need to extract it on disk and can create images in richtext (PNG, JPG and GIF I think).
And there was a question about a calendar&scheduling API in Domino. This is built into the legacy LS/Java APIs as NotesCalendar class and also available via Domino JNA.
Here is the documentation:
Unfortunately there are not many examples how to use the API.
But maybe this helps: https://www.youtube.com/watch?v=rTmxIZjeoJ8