Sacramento has an active club (MARS) and a very, very active online presence on Facebook with the 916 club. However, and I am biased, if you don't mind driving and are looking for learning experiences and great events BAR is the place to be.
BAR hosts two frag swaps a year, attends and works at two Coral Farmer's markets every year, and has near monthly events scheduled all throughout the year. These include workshops such as fish food making, construction of good lid for the tank, speakers such as Richard Ross (formerly from Steinhart). Also, they tour places like Kessil and behind the scenes at Steinhart.