How to run a macro on slide change for impress?

I’m using LibreOffice 420m0(Build:2)
and noticed that one assign run a macro to run at the Event “Change of the page count”, see
Event-Driven Macros - LibreOffice Help , but there is
no such event in Impress.
I’m looking for an event to assign a macro to when a specific slide in a presentation appears.
Is there a way to do this?

You probably need to search for “transition” rather than “event”. Does the Apache OpenOffice forum thread here help at all?