On the moderator-only Create/Edit page for Community Events (
/admin/community-events), the text box that contains the number of days or hours ahead of time in which to show the event displays as empty, despite the fact that there's apparently a value in there.
If I create the event without attempting to modify the value, the event is created using the default value of 7. I can't tell with reliability what happens when I try to type into that box, but it's not helpful.
I have seen this issue on Mi Yodeya, on a Windows 7 computer, using Chrome Version 70 and using Internet Explorer 11.