[Ghoulish Delight]

Okay, we all have cell phones, so I don't think it should be too hard, but just in case it turns out to be nutty over there, I'll suggest a meeting place, since I know the area.

There are 3 main parking lots for the civic center, one just off Alton, 2 off of Harvard/Civic Center Plaza. They're big and it's a Saturday so there won't be many employees there, but I imagine they'll fill up quickly. There's street parking in surrounding neighborhoods.

My proposed meetup point is across Civic Center Plaza from actual city hall. If you're coming off of Harvard and turn onto Civic Center Plaza, there is a parking lot on the right, past the bunny crossing sign (yes, bunny crossing sign, even though I've never seen a bunny there). Turn right (or walk right if you've parked elsewhere) and head straight towards the fields/stadium, there are some flags, a plaque, a large planter and a drinking fountain, easy to spot. I've traced a bit of the route and circled the spot on the map and the satelite view below. The "A" marks City Hall.