Filter event reports by facilitator
I had a client with a similar issue.  They resolved it by not adding a facilitator to any events they didn't facilitate.

Assuming that's not a workable workaround for you - it IS possible to generate reports like you're describing, but you'd need to either a) code it (or find someone to code it), or b) use an (often pricey) third-party reporting tool.  Come join us at https://chat.civicrm.org if you'd like to discuss custom reporting options - either doing it yourself or finding someone to do them.