Ars Magica enthusiasts have still got time to sign up for the Grand Tribunal conventions, happening in a couple of weeks' time (Aug 19-21) in Cambridge UK and Solvang CA. See these links for more info:
Grand Tribunal UK: http://gt11.ekkaia.org/page/About and http://www.consternation.org/
(Grand Tribunal UK is taking place within Consternation II, a general gaming convention)
Grand Tribunal US: http://us.grandtribunal.net/main.html or on the Atlas forums or Facebook!