Ballet Aficionados Invited to Tea, Tour and “Swan Lake” Dress Rehearsal     In anticipation of this month’s production of “Swan Lake” by the Los Angeles Ballet,  Leslie Kavanaugh and Susan Rothenberg invited dance afficionados to an afternoon tea, a tour of LAB’s Brentwood facility  and a preview of the ballet.  Choreographed by LAB’s artistic directors Colleen Neary and Thordal Christensen, the production will continue through Mar. 31 at various venues throughout southern California. The Feb. 21 tea also precedes LAB’s Swan Lake Gala, which will take place at the Montage in...