Harmonycon 2023 had a MASSIVE plushie meetup (plus 1 fursuit) on the 3rd day. Besides this pile, there were many more scattered around the room. Wouldn't surprise me if there was upwards of 300-500 plushies there.
Of interest is the plushie of Trixie as a porta potty (look above the big Twilight towards the left) XD And the giant Luna I purchased there is laying on top that mass of sewn together Derpy heads.
If you can ID some of the others and tag them please do.