Now, given a presentation on a given day, I would like to automatically list all the presentations given. However, my ask (on the same page) fails to show me a) Presenter, b) Title ("the page") and c) File:... or Media:....pdf link to the files directly
You were not storing the date, so the query returned nothing.
The [Category] parameter had two semi colons, so the query still returned nothing :)
The link to the presentation file was not being stored. I've created a property to hold it. I've also switched from file: to media: so the presentation opens immediately when the link is clicked.
I've also set the default form, so you now get the "Edit with form" link showing.
I've added an 'if statement, so if there are no keywords it does not show the text. We should probably do this elsewhere on the site as well as it looks tidier.