Embedded Google calendar not showing in Chrome and Android

I have a Google calendar, embedded with an iframe. It recently stopped working with Chrome and Android browsers. It does work with Firefox, IE, and on an iPhone. The calendar appears (or doesn’t!) on https://www.golden.com and https://golden.com/calendar-of-events/.

That site uses a custom theme, so I tested it on another site that uses a standard twenty twelve theme, but have the same problem with the same browsers. Here’s the test page: https://saoirseforsouthgolden.com/test/.

Thanks for any insights!