I tried to get numbers on an "event" (that amounts of everyday editing for 94 people). The URL is https://eventmetrics.wmflabs.org/programs/150/events/364 ("First quarter WPMED edits" in the program "WikiProject Medicine test".)
It told me that it was currently crunching the numbers. A couple of hours later, it stopped saying that, but nothing else happened. There are no numbers, no new buttons, etc.
This is a screenshot of what the browser window looked like in the end: