I absolutely love it that folks have playa weddings! That said, the only ones I've attended are those of people I know...or sorta know.
There are tons of playa weddings. Some are huge extravaganzas, most not...kinda depends on the size of one's playa entourage or camp. Most of the attendees get there by invitation or word of mouth...can't recall seeing one that made it to the WWW Book.
Unless yours has some sort of unique, never-been-done-before aspect to it that would pique the interest of the "Book" committee ensuring selection, I'd recommend coming up with an alternative announcement format...especially if it's your intent to have a large gathering. Maybe something on the order of 10,000 printed invitations with the promise of vodka jello shooters immediately following the ceremony.
Hope your event makes it to the book, but in the off chance that it doesn't, when and where do you plan to have it? I'll be there! (I luv jello shooters)
Don't bore your friends with all your troubles. Tell your enemies instead, for they will delight in hearing about them.