Starry (and often epically long) concerts are a Metropolitan Opera stock in trade.

In 1966, the Met bid farewell to its old theater with an all-hands-on-deck gala, and cast-of-dozens spectacles have been mounted over the years for retirements, anniversaries and the company’s centennial, in 1983 — a concert that lasted 11 hours, with dinner break.

All those events, while sometimes shot through with melancholy, were celebratory in spirit. The “At Home Gala” the company is planning for Saturday, April 25, is far different, coming as the Met has been forced to cancel the final two months of its season and begin an urgent effort to raise the tens of million dollars it is losing because of the coronavirus pandemic.

The Met announced on Monday afternoon that the concert will feature more than 40 artists, including stars like Anna Netrebko, Jonas Kaufmann and Renée Fleming, performing from their homes and streamed on the company’s website, metopera.org. (In true operatic style, it is an international bunch, with singers hailing from as far afield as Poland, Wales and New Jersey.)

“It will have a homespun quality,” said Peter Gelb, the Met’s general manager, who will host the concert from New York, alongside Yannick Nézet-Séguin, the company’s music director, who is in Montreal.