On Wednesday nights, Greg and I really like to attend the Tango practica at Step 1, which is located at 1920 T Street in Sacramento. DJ Mike Bohan plays excellent traditional Tango music (and of course Milonga and Vals) from 9:00 to 10:45, and the cost is just $3.
This is generally a pretty intimate group--between 10 and 20 people each week. The quality of dancing is high, although the atmosphere is friendly and welcoming. As is expected at a practica, it is completely acceptable to stop and work on something if you need to, although of course you want to be aware of the people around you so you don't obstruct traffic.
The floor is not large, but there is plenty of room for the size of group we usually have. We have occasionally gotten relatively crowded, but there was still room to dance. The floor is not wood--I think it's some kind of linoleum, so it's a bit hard, but we're only on it for 1:45, so it doesn't bother me. It's pretty smooth and usually clean.
Greg and I try to make this one every week, so I hope to see you there!