Which opera was written earlier, Punch and Judy or Einstein on the Beach?
Punch and Judy (opera):  Birtwistle wrote the score from 1966 to 1967. Punch and Judy (opera):  The opera was first performed at the Aldeburgh Festival, which had commissioned the work, on 8 June 1968, with David Atherton conducting the English Opera Group. Einstein on the Beach:  The premiere took place on July 25, 1976, at the Avignon Festival in France.
i don't know