Overriding the theme:
Theme only has event type. I have duplicated it to have a separte talk. Only did it with compact view, as that's what I'm using.
This involves the
layouts/partials/page_metadata.htmllayouts/partials/views/compact.htmllayouts/section/talk.htmllayouts/talk/single.html
To display list of people, i.e., research team. Not supported. I've used the compact list.
Added "people" instruction in layouts/partials/views/compact.html to not display date.
I just did the people thing also for a past-people folder. Hacky solution, but fine for now.