Not sure I can help much, as I'm not really doing those kinds of pitches. Maybe follow the guidelines of the festival?

A Hollywood pitch to a production company or studio is 20-30 minutes and covers the basics... the world, the plot (if it's a feature), the characters, details about the teaser and then an overview of the pilot (if it's a series). Pitches are never done in written form, and there is no leave behind. You go in with a pitch document, which is about 10 pages max and is, more than anything, a script for your presentation. Often writers who feel awkward in meetings will just read their document out loud from the page.

Again, it's not at all an elevator pitch or a list of loglines. It's a detailed overview in verbal form of your story and characters. My guess is that a pitchfest is entirely different. Sorry