12:00 is maybe too early. E.g. if I traveled from Munich to Graz, I'd have to get up at around 4:30. Vienna to Graz takes about 3 hours, so folks from Vienna would have to take the train at 8:45 which is still quite early, if you ask me :-)
you could make a doodle-survey just to see how many folks will show up and plan accordingly. Or you could make some surveys here on LW. Just write comments like e.g. "Is 12:00 too early? Vote this comment up if you think so."
for the location: It has to be relatively quiet since discussing in noisy places sucks. User:eurg's suggestion looks good.
Discussion article for the meetup : Graz Meetup
WHEN: 28 April 2012 11:21:03PM (+0200)
WHERE: Graz, Steiermark, Austria
Meet up. Please upvote the comment post asking for attendance, and the subcomments for date, time, location, and any other suggestions.
Discussion article for the meetup : Graz Meetup