I’ve only recently found this out, but: the COC actually engaged their own administrative and artistic staff as the models in the promotional photos for the new season. The lovely people we see in those B&W pics in posters and programs for Otello, Hadrian, Cosi, Onegin etc are the COC staff. I’ve read somewhere (I think it was John in Opera Ramblings) that they also honoured their staff in the 18/19 season launch event, which is equally fabulous.
Reminder that only about 15 percent of the COC budget comes from the government. The rest needs to be self-generated year after year. Chapeau to all who make that happen.