Pfft it's Cirque. As awesome as they are, they will only want their own performers, they rarely let anyone "outside the troupe" join in. If you think about it though, most Cirque shows have between 30 and 40 performers, and there's currently 15 shows worldwide, either fixed or touring (Ignoring the Beatle's show and the Criss Angel Show they're part of). Then work out how many of their performers can competently stiltwalk, which I would guess to be about 75% of the cast per show going on their level of skill. That's gonna be about 390 people on stilts. That's not a massive record considering they're spread worldwide.
I reckon if we got everyone on here and PP up bocking at the exact same time, we could get very close to that number.