In case that this is not an April Fool's Day joke, I'll try to come. Sunday seems good enough (though 12:00 is a bit early-birdy...)
As this is at lunchtime, I'd vote for something like Koko, Südtiroler Platz: The food is good, it offers more than one vegetarian dish, and it is not only in walking distance to just about all the inner++ city of Graz, but also reasonably close to a parking place should anybody arrive by car.
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