Why not just host the burning man info pages as a wiki? Having the "bike" page link to a camp that rents and repairs bicycles, is exactly the kind of information that would probably be put there if it was hosted as a wiki. If they're worried about people vandalizing the wiki with junk posts or off-topic advertising, they can restrict wiki editing either to highly trusted people (to pre-emptively prevent abuse), or to people whose identities are known (e.g. Burning Man ticket-holders -- that won't pre-emptively prevent abuse, but at least you can sanction blatant rule-violators after the fact).
Generally, I think there is a common bias towards efficiency in terms of tangible things (food, water, trash, pollution) but not for intangibles (mainly time). Suppose you optimistically assume there are ONLY 10 other people like me who spent an average of an hour reading the survival guide, the first-timers guide, the official "bikes" pages on burningman.com, and posting in forums, looking for information about how to get a bike to Burning Man, before someone finally said "You can rent a bike on the playa." If someone had spent one minute editing the burningman.com "bikes" page to say "And here's where you can rent a bike on the playa", that one minute of editing time would have saved 10 hours of searching time for everyone else. That's a far greater benefit to the world than packing down your trash so it fits into a single plastic bag. If there's too much of a time bottleneck for the people who have editing privileges on the site, then the wiki would help with that.
I think the biggest favor you can do for the world is not to be completely self-reliant, but to be time-efficient in a way that involves mutual reliance (you spend one minute posting information that saves me an hour of searching; at some future point I'll do the same for you, and we both come out ahead), and then use the time savings to do something else useful. I really, actually did blow off helping a friend move because I was busy trying to find information about how to get a bike to Burning Man; if the "bikes" page had just had a link to the bike rental camp, I would have been done, and I could have gone and helped him. If they do create a wiki for next year, I'll happily volunteer to add whatever I learned this year, if it would save time for other people.