Set the mode dropdown at the top of the Schedule tab to Asynchronous. It is a separate programme from the on-site and online ones, and a conference can run all three.
The filters rail works exactly as it does everywhere else — search, themes, types, and My program.

Star what you want as you browse. My program is the closest thing an asynchronous programme has to a schedule, and it is the only thing that will bring you back to a presentation you meant to watch.

Open calendar view in this mode and there is no grid: no rooms across the top, no hours down the side, just a stacked list of coloured rows. That is correct behaviour, not a fault.
Stay in list view here. It is the better of the two by some distance, and calendar view has nothing to add when nothing has a time.

Open the presentation page, and it has two halves.
Watching is only half of it. An asynchronous presenter gets no applause, no questions from the floor and no idea who was there — a post on the board is the only signal that anyone came. And neither half expires: the media stays up and the board stays open indefinitely.

It does not. There is no start time and nothing to miss — which is also why nothing will remind you. Star it and come back.
That is correct in this mode. Asynchronous presentations have no time and no room, so there is nothing to plot. You get a list instead.
That is the length of the presentation, not a slot. It tells you how long to set aside, not when to be there.
Check the paperclip count on the listing first. A zero means nothing has been uploaded yet — media deadlines fall shortly before the conference.
Yes, on the presentation’s discussion board. It opens the day before the conference and stays open afterwards, and the presenter gets both a notification and an email.
A presentation with no duration attached, usually a poster. It opens exactly like a talk — same page, same media, same discussion board. Only the length is missing.
No. The media stays up permanently and the discussion board never closes, so a presentation can be watched and asked about long after the dates.