When I try and determine the start time of an event I will typically enter the time in google. As a recent example, I entered 9 am PDT, 12:00 EDT, 17:00 BST, & 18:00 CET. The results I got were 2 am, 2 am, 3 am, & 4 am, respectively. So while odds favor 2 am, I am still unsure. Sadly though, 2 am wouldn’t be fair on others around me, so I won’t see you at the Jensie Gran Fondo
Until the synced calendar is (hopefully) implemented, I think it might be less confusing to enter just the UTC (GMT) time.