Sparse array calendar not working #454
Description
Please describe the bug or issue including how to reproduce it.
From recent conversations in the scipy repo, it seems there was a sparse array meeting on 7/21 but it's not showing up (for me at least) in google calendar when importing from URL.
Add any other context about the problem here, screenshots, etc.
I do see that it renders in the widget on scientific-python.org/calendars, so this only affects the import URL.