San Francisco Opera, Education Studio, All About Hansel and Gretel. Interactive family workshops to accompany performances of San Francisco Opera’s Hansel and Gretel. These workshops are designed to explore Engelbert Humperdinck’s whimsical opera–by learning about the story, music, production design and characters. Attendance at an opera performance is not required to participate in these workshops. Workshops are for families with children ages 6 and older.