If it’s an acronym, could you use the h as the second letter of the previous word?
Then you could say “Hobnobbing with Hobgoblins.”
Though perhaps not everyone would find that as amusing as I do.
Make one up. Try ‘house-holding’. Adequate bluffing skills and you’re set.
“* Yeah sure, that’s exactly what it means, fits our client need perfectly*.” Don’t tell me this doesn’t happen all the time.
From the Original Poster:
(Bolding mine)
Heart-to-Heart or hearsay, although neither of those are probably what you’re looking for.
Holler (holla!)
Homily?
If it isn’t too obscure for your purposes, “haver” is a Scottish term for pointless nattering. The Proclaimers use it in “500 miles”:
And if I haver, yeah I know I’m gonna be,
I’m gonna be the man who’s havering to you.
Hootnanny!
Hark!
Oh I love that song. I always wondered what that meant. What a fun word.
Yeah, I think it’s a great song. I know “haver” only because I asked a Scotsman I was working with when the song came out. It became a bit of an in-joke with us when we encountered any overly-talkative people.
Head-to-head would work in this instance: it indicates a close discussion or connection between two people. It also signifies the transmission of thoughts and intellectual conversation among peers that may be appropriate for an academic assignment such as yours. Just my two cents 
If you’re having trouble finding H words, go with an alternate word for Halloween. “Samhain Symposium” has a nice ring to it Or All Saints/ All Hallows.
I always assumed that was slang for masturbation. Interesting.