I wasn't able to replicate but I did notice those images were residing on stage. While images weren't broken, they shouldn't have been residing on stage so I uploaded them to production and adjusted the links.
If you inspect or open each image in a new tab, you should see them.
@angelcityjazz reported the first row of images in the past programs section were broken on https://angelcityjazz.com/angel-city-jazz-fest/
I wasn't able to replicate but I did notice those images were residing on stage. While images weren't broken, they shouldn't have been residing on stage so I uploaded them to production and adjusted the links.
If you inspect or open each image in a new tab, you should see them.
Might need to refresh or clear the cache to see.