Every time the second Saturday of the month rolls around, there’s a Welsh Corgi (both Pembroke and Cardigan) meetup at Mountain Lake Park in San Francisco, around 1 PM. I finally got around to showing up at one. Here are a couple of pictures. I’ll post more some other time.
(Whups, corrected the location.)

I think there are actually seven corgis in this picture, although it's kind of hard to pick out the seventh...
I think it’s actually Mountain Lake Park, up in the Richmond District.