Christmas carols filled the air on Sunday at Strathearn Historical Park in Simi Valley, where local authors signed books, historic houses were decorated for the holidays and Santa took requests from more than 100 children.“As always, we hope that people will learn more about the park and spark their interest in our history because … so many people have lived here and never been to the park,” said Judy Pepiot, of Simi Valley, a park board member and one of numerous volunteers on site.Sunday’s free event featured live entertainment by harpist Elaine Lister and flutists Mary Predmore and Rhondda Dayton.In the visitor’s center, local authors giving book signings included P.W.