The quarterly SLUG meeting will feature a presentation about OpenStreetMap by yours truly (Martijn). This event is organized by SLUG and you will need to sign up. I will provide a link to do that when I get it. It's free and box lunch is provided. An excellent opportunity to meet GIS / map folks.
It will be at the Doty Education Center in Murray.
More info about SLUG and sign up for their mailing list here: http://www.slug-gis.info/home