I'm sorry but its a huge body of work. I can only provide names at the moment, not specific sessions.

both Lyssa Royal and Darryl Anka talk extensively about the Orion civilization in their work.

Both of these people are in the public eye and can be contacted for questions.

for introductions to their work, I like to recommend Lyssa Royal's book 'Prism of Lyra' ( http://www.vielewelten.at/pdf_en/prism%20of%20lyra.pdf )

and Darryl's documentary 'First contact' ( https://m.youtube.com/watch?v=e-CoNQm5hjc )

I'm not sure if those specific works talk much about Orion by name, but both people have huge bodies of work. check torrent sites for collections of their audio sessions; i have listened to hundreds of hours and still not heard it all.

Michael Tsarion does not mention Orion by name AFAIK, but his version of history lines up remarkably well. another massive body of work.

I can try to look for more specific sources. hope this gets you by in the meantime