This meetup is an attempt to gather a group of like minded, critical thinking individuals together, stick them in a pub, feed them beer and see what happens.

If you've just stumbled across this meetup here's what I would consider the best description of what it is to be a Skeptic;
"A skeptic is one who prefers beliefs and conclusions that are reliable and valid to ones that are comforting or convenient, and therefore rigorously and openly applies the methods of science and reason to all empirical claims, especially their own. A skeptic provisionally proportions acceptance of any claim to valid logic and a fair and thorough assessment of available evidence, and studies the pitfalls of human reason and the mechanisms of deception so as to avoid being deceived by others or themselves. Skepticism values method over any particular conclusion." - Dr. Steven Novella of The New England Skeptics and The Skeptics Guide to the Universe podcast.