Interesting. I have never heard of nor been invited to a party like you are describing. It would still feel like a sales pitch to me, even if there was nothing to buy right then and there. I'd much rather be invited to something with absolutely no agenda attached to it, especially from a friend.
Having said that, your menu is fine for what it is, which is a vegetarian themed meal. It wouldn't be my first choice but if you were a friend and this is what you served me, I wouldn't make an issue out of it or anything. My only issue would be feeling a little awkward thinking that you were working for the company or something.