Sadly the Windows event logs show nothing other than the host disconnections event (ID 701 in the application log).
ESXHOSTNAME01: Alarm 'Host connection and power state' on ESXHOSTNAME01 changed from Green to Red
ESXHOSTNAME02: Alarm 'Host connection and power state' on ESXHOSTNAME02 changed from Green to Red
ESXHOSTNAME03: Alarm 'Host connection and power state' on ESXHOSTNAME03 changed from Green to Red
etc