If you’re a Twitter user, you like the idea of extending your virtual community into the real world, and you’d be keen to help a worthy cause, Twestival is right up your street.

On February 12 in over 100 cities around the world, local Twestivals will be taking place which will bring together Twitter communities for an evening of fun and to raise money and awareness for charity: water, a non-profit bringing clean and safe drinking water to people in developing nations.

There are over 100 cities officially signed up to participate, including London, Paris, Philadelphia, New Orleans, Austin, San Francisco, Vancouver, Toronto, Montreal, Dublin, Munich, Amsterdam, Bangalore, Melbourne, Lima… the list goes on. And new cities are still coming on board.

But its not only large and famous places – Twestivals are taking place in all sorts of other towns and cities. For instance, I’m pleased that Reading, a town just down the road from me, will have a Twestival as well and I’ll be there.

In case you’re wondering how Twestival got started, here’s how:

In September 2008, a group of Twitterers based in London UK decided to organise an event where the local Twitter community could meet offline, meet the faces behind the avatars, enjoy some entertainment, have a few drinks and tie this in with a food drive and fundraising effort for a local homeless charity. The bulk of the event was organized in under two weeks, had close to 300 people in attendance (with a waiting list) and was able to do some good for charity in the process. There were also events in Toronto, Vancouver and elsewhere around the globe which found that Twitter was a great way to bring people together for a social cause. After the first Twestival there was significant coverage and interest to do it again in London. Organizers decided to host one every quarter; but then wondered if this concept would translate to other cities around the world. It could be a powerful thing to have multiple cities around the world host events on the same day, for the same charity, by people who are all connected via Twitter. We are about to find out exactly how much on 12 February 2009 with Global Twestival! Thank you for being a part of this exciting and collaborative experience.

If you’d like to help in a volunteerism role with any kind of Twestival organization, wherever you are, get in touch with Amanda Rose or Jaz Cummins. For updates, follow @twestival on Twitter.

Hope to see you on February 12.