I founded and still, five+ years on, run/host Nerd Nite Wellington - part of the international Nerd Nite movement.
A speaking event, NNW aims to democratise education by bringing together three speakers every two months or so, to talk about their nerdiness (read: things they know lots about).
In a bar.
We regularly attract ~100 people, from all walks of life, and have had talks on everything from witchcraft to geoengineering.
Oh, and I'm always looking for speakers!