I may possibly end up identifying as poly, but I have never been in a relationship

I may possibly end up identifying as Santa Claus, but I have never been to the North Pole, and I actually don't like Christmas.

Sorry for bluntness, but I understand how people can live in a poly relationship, or how people can desire to live in a poly relationship even if at the given moment they are not... but what is the point of "identifying as poly" if you do neither? Do you get a sticker for being a good ally?

the person coordinating the seminar thought that it would be better to leave out rationalist stuff

I agree. The connection between rationality and polyamory is mostly accidental. Most polyamorous people out there don't give a fuck about rationality. And while quite many people in the rationalist community go "yeah, having more relationships is obviously better -- other people just never thought about it because they are not as smart as we are -- what could possibly go wrong?", there has already been some drama, and it is too soon to tell whether this experiment will turn out to be a net benefit.

Maybe history will put polyamory in the same bin as "followers of Ayn Rand believed it was rational to smoke". Maybe not. But so far I think it is better to think about "rationality" and "polyamory" as separate topics.

I have a pile of reading to do before I plan this session

Perhaps it would be better to read (subset of) the pile first, and ask later. This way it feels too much like "please, do my homework for me".

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Uhm, I guess it would be nice to also answer some of your questions. Not being poly myself, I can only suggest generally:

Read the pile. Optionally, write a summary and ask here for feedback on that. Make a 25-minute presentation based on that summary, and leave 20 minutes for debate. (That way, if you accidentally keep talking for 30 or 35 minutes, there will still be some time left for the debate.)