Why is my SQL Server reporting CLR_AUTO_EVENT waits when I don't even use SQL CLR?
SQL Server uses CLR internally for several features, and these waits track CLR background threads just sitting around waiting on a ManualResetEvent or a AutoResetEvent.  According to High waits on CLR_MANUAL_EVENT and CLR_AUTO_EVENT these are background waits (ie the wait time is not happening to user sessions), and can safely be ignored unless you have unsafe CLR code using these events directly.