Try WalkInDanceOut in Redondo Beach.
They have a web site. Redondo Beach is not that far from Hawthorne.
Also, the Hacienda in El Segundo (down the street literally from Hawthorne)offers group classes via qualified instructors. They normally have a great group of people that come as well as WalkInDanceOut. Many of them know of studios closer to you. If you can drive to Torrance/Lomita there is another studio as well.