Where to start..?

[Tw****]

I want to throw an orgy for our anniversary! How do you even start?! Craigslist? Facebook? Thrifty Nickel?! The masc-folk half of the equation is easy peasy, but finding fem-folk is absolutely baffling me. Tips? Tricks? 

[ge****]

Being absolutely honest I rate your chances as minimal at best - as you deduce finding men will never be a problem, but finding women willing to attend that are not looking to be paid, and who have sufficient trust to turn up at a complete strangers party will be nigh on impossible, especially if that stranger doesn't have an established reputation for throwing parties of this type.
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If you have one near you, why not adjust and go to a swingers club or similar?

[ey****]

I found the easiest way to find fem-folk for an orgy is to know fem-folk who would want to be involved.

masc-folk of course are easy to find (although, in principle - many might be all for it then no show... we've all been to gangbangs where 30 said they'd attend and 3 showed, right?) but of course the lack of vetting for masc-folk then becomes more off-putting to fem-folk

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So yep, either pay folk to be involved or go to a swingers club - at said club you can approach any couples to be involved.