Hi, thanks for the interest in our plugins I can answer your questions.
Just wondering if it’s possible to publish facebook events (from multiple pages) WITHOUT creating a new post (db entry) for each event.
I am afraid that is not a feature we have, each one we be created as a new Event Post. I could see that as being possible, but that customization would be up to you and be beyond the support we can give.
If you think that is something you would like as a feature I encourage you to visit our User Voice Page and either upvote an existing request or make a new request there.
http://tribe.uservoice.com/
Thanks