Jakub Jozef Orlinski relaxes on the set of a film tied to Vivaldi's 'Stabat Mater'. ANNA LIMINOWICZ/nyt

When foreign stars visit the Glyndebourne opera festival in the countryside outside London, it's common for them to participate in some time-honoured English rituals, like sipping Pimm's on the lawn or nibbling on a scone for afternoon tea.