This shelf is empty, and that is the accurate state rather than an unfinished one.
The other four shelves are built by a single rule: an entry appears here because a note in this garden cites it, and the entry carries back-links to those notes. Auditing every ## Sources section across the garden turns up books, papers, courses, and code, and no talks. Not one note currently rests a claim on a recorded talk.
The alternative would be to fill this page with famous conference talks nobody here has drawn on. That would make the shelf look complete while quietly breaking the rule that makes the other four trustworthy: everything listed is something the garden actually used. An unread link is worth less than an honest gap.
So the entry condition is simple. When a note cites a talk in its ## Sources, that talk gets an entry here with a back-link to the note, the same as everywhere else.