Morning Mapathon: Help Mapbox Trace Buildings on the San Francisco Peninsula

Details
The task:
Our friends at Mapbox are launching an effort to map all of the building outlines on the peninsula: http://tasks.openstreetmap.us/project/12
The applications of this data are limitless: earthquake analysis, sprawl and development studies, you name it. But actually. Name it. I want to know.
In order to help them out, let's have an impromptu & informal mapathon before we all check out for the holidays.
Here's how you can help:
(1) Join me at HanaHaus at any point Sunday morning (feel free to pop in and out). We can map together, enjoy some delightful Blue Bottle coffee, geonerd out, and I'll walk any OSM beginners through the process.
(2) Map on your own time! Use the links and resources below to contribute to Mapbox's efforts at your convenience. Feel free to use the comments on this event to find a mapping buddy and organize your own informal mapathon.
Event info: HanaHaus is located on University Ave & Kipling Street. There's some free work space and a paid coworking space ($3/hour). Depending on how many people plan on joining, I'll update the event with which space we'll be in. Bring a laptop.
Resources:
Hanahaus: http://hanahaus.com/
Beginner's guide to OSM: http://learnosm.org/en/beginner/
More OSM tutorials: http://mapgive.state.gov/learn-to-map/
Always remember: http://wiki.openstreetmap.org/wiki/Good_practice

Morning Mapathon: Help Mapbox Trace Buildings on the San Francisco Peninsula