Yes, I entered my Google account under "Settings > Accounts" in CalenGoo. Therefore I have two
mye...@gmail.com calendars:
mye...@gmail.com (Google in dark blue color) and
mye...@gmail.com (GMail iPhone Calendar in light blue color). I turned "Show iPhone calendars". In my Edit View -> Default calendar ->
mye...@gmail.com (GMail iPhone Calendar in light blue color) is checked. I tried to use only
mye...@gmail.com (GMail iPhone Calendar in light blue color) as a default calendar, but it synced the new event and showed it in my iPhone widgets and Apple Watch only if I start the default iPhone app
Calendar despite the event was synced immediately.
Therefore I had to switch to
mye...@gmail.com (GMail iPhone Calendar in light blue color). I didn't have a choice to make the event visible on my iPhone and Watch.