It was the following line I failed on:
GroupWise.ViewOpenNamed “Week”, 1, “”)
I see now that it is important to have the lines in the correct order.
and not the other way around (apparently, DateAbsoluteGoTo applies to the ‘current calendar view’, which by default is the main calendar view – OpenCalendar apparently does not create a real ‘view’, whatever that is …).
Hope this helps other people avoid the same problem later.