A couple schools did literally pass out fee waivers at a LSAC forum I visited last year.
Really? Huh, but those schools are worth attending or Tier 2-3 schools? Can you name specific schools?
I don't remember all of the schools, but IIRC it was at least GWU, Fordham and BU. There were one or two other ones as well like Alabama that I think offered fee waivers through mass email regardless.
I had to ask the Fordham guy, nonchalantly telling him my GPA/LSAT, and he gave me his business card and told me to email him for a fee waiver form. I think the Notre Dame rep had the same deal. I might be switching a couple of the schools around since it's been 7-8 months. But if you're not shy about asking for fee waivers, it's definitely possible to get them at LSAC Forums.
I think UChicago (it may have been NU) had some type of trivia as well through their twitter... if you tell them the correct answer to the trivia at their LSAC Forum table, you get a fee waiver.
This may be different in different cycles/forum locations so YMMV.
ETA: Dress code - I wore a button-up and sports coat, but felt a tiny bit overdressed because most attendees didn't wear jackets and the venue got fairly hot. On the flip side, I felt confident talking to everyone because that's what I typically wear to work and most of the law school reps were in blazers so it wasn't too bad.