I don't know if there are any Regency enthusiasts in the greater Sacramento area, but there is ECD dancing on the first Sunday of the month in Roseville at 2pm, and I believe there is often live music.
I dropped in today and it was great fun! It was crowded and there were plenty of gentlemen. In fact, I don't recall seeing any ladies dancing on the "wrong" side. There was live music, too, which was a real treat, and quite a few younger people. No pushy "helpers" either ;-)
High School students are $5, College $8, and Adults $10. There might have been a senior discount, too. Plenty of free street parking.
There's no dance next month, but there is another on the first Sunday in September (I think it's 9-1-13).
"Thus happiness depends, as nature shows, less on exterior things than most suppose." -- W. Cowper