Thanks for the tip Dimitri. I unfortunately did not have much luck with Meetup before it self destructed as you say. Any ideas would be good.
Actually, it didn't self-destruct. Someone (Dr Eugene Dubossarsky) beat you to it and stepped up as an organiser, and renamed the group to be now called "Data Visualisation". It retained the same page and URL. You can still join and become one of the organisers, or post a message to the group.