Missed American Ballet Theatre's "Swan Lake" at the Music Center? For a top price of $38, you can catch four ABT stars, plus principals from San Francisco Ballet and the Scottish Ballet, tonight or Monday at the Irvine Barclay Theatre in Orange County as part of the 20th-anniversary celebrations of Salwa Rizkalla's Festival Ballet Theatre ( www.festivalballet.org). ABT's Irina Dvorovenko and Maxim Beloserkovsky will appear tonight at 7. The company's Jose Manuel Carreno and San Francisco Ballet principal Lorena Feijoo will dance at 7 p.m. Monday. Gennadi Saveliev of ABT and Quenby Hersh of the Scottish Ballet will be on the bill both nights.