First meet & greet to get to know everybody and talk about content/ideas for the group (probably afterwards in a pub)
The content of the meetup will be a coding dojo (http://codingdojo.org/cgi-bin/index.pl?WhatIsCodingDojo; http://codingdojo.org/cgi-bin/index.pl?RandoriKata; )
A laptop with a development environment, including a test-framework, in the programming language of your preference. A version control system, ideally Git, is also recommended.
Prepared means: A few mouse clicks or key-shortcuts, and a dummy-unit test is green.