How do I get in on this black market harvesting shindig? I would like to get the Harvesting achievements. How do I go about doing this?

That was a part of this years Survival celebration (aka, our February/Valentine's day event), so it's not currently something you can do. It might come back next Survival.

Oh I see :( I'll keep my scalpel at ready until then. Thank you for the quick reply. :)