Hi Hammerhead --
I'm not sure whether this is the best place to contact you, but I wanted to let you know that I'm tentatively planning a mapping party for Saturday, July 12, starting in or near Patterson Park, depending on weather and interest from the community.
This was originally going to be a bar crawl, but then I realized that it probably wasn't smart to have a bunch of random people drunkenly stumbling around the less-documented parts of Baltimore. So think of it as more of a picnic. (This is also a good time to mention that this event is in no way affiliated with my employer -- it's just for fun.)
If you're interested, drop me a line, and I'll give you more details as the date approaches.
Please feel free to pass this along to others. I'm at firstname.lastname@example.org.