These are fun, typically take the form of Psy-Trance doofs down here in Australia. Typically have a big hippy vibe but also more cyb sorts. Often they'll be very heavily aligned with environmental groups, aboriginal rights, etc. etc.
Also good for scoring really good acid. You only end up paying for your first trip, from then on in it usually ends up being just handed to you the minute you mutter something under your breath about the drugs wearing off.