Matrix which shows only where CountRows is blank

I am using the following measure to show me how many instances of an Event have taken place each day:

EventCount = CALCULATE(COUNTROWS(EventsTable), EventsTable[EventCode] = 5)

This produces the below matrix, which is perfect. It shows the Site_ID as well as the individual machines within that site and a count by Date and Day Name. The Date and Day Name are in a separate calendar table, linked to the EventsTable by the Date.

What I would also like, however, is a matrix that only shows the machines where there was no instance of the EventCode occuring on a particular day - in other words, just the three parts I've highlighted in yellow.

Is this possible?

I've tried adding "+0" to the end of my measure (in order to then filter the visual to just show where the EventCount = 0) but that just changes everything to zero. Using If(ISBLANK(EventCount), 0, EventCount) does the same.

Plus, if I just filter the visual where the EventCount is blank I get a completely empty matrix.

Thanks for your help!