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.
I would rather avoid Tik-Tak as meet-up location, as well as similar bars/cafés. Loud music/loud crowd, little light, much smoke... These reasons are behind my suggestion to go to somewhere more restaurant-like.
I myself will refrain from proposing further places, as too many options won't make it any easier.
Some suggestions:
Don't know if this was helpful.
Nice! I'll probably be there (70%). Do you have any concrete location in mind?
ETA: Ah, the sin of overconfidence. 70% is too high. I didn't know that you need 6 hours from Munich to Graz.
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