I went last time, and it was pretty fun. Extremely crowded. Very young crowd.
Last time, you had to sign in at the door. Now they want you to sign in in advance on the web.
"The Next SF Underground Market is Here!
The SF Underground Farmers Market is a venue where you can taste and purchase the food that is being produced in backyards and home kitchens in the Bay Area.
This time we've got over 40 vendors selling everything from pastured pork and beef to home brewed ginger beer...
We've also got a long list of food cart vendors, so there'll be hot food such as pulled pork (Good Foods), Mexican (Soul Cocina), wild boar belly buns (forageSF), home made chai (Chai Cart), and more...."
When: Saturday March 6th 5-11pm
Where: 9 Langton St in San Francisco (near 7th/howard)
Here's a Chow blog on the last event. (The author apparently did not see me there, since he says he didn't see anyone over 30!