WHAT is about the OBJECT
HOW is about the METHOD
WHY is about the REASON
WHO is about the PERSON(s)
WHEN is about TIME
WHERE is about LOCATION
what is this* car [called] - OBJECT.name.car; tool transport brand
how is this* car [called] - METHOD.name.car; written, spoken, pronounced
what is this called [object.named] item.name
how is this called [method.named] item.naming method — written, spoken, pronounced
and
What is going on: OBJECT.event
How is [it*] going on: OBJECT.event.method
What did happen? OBJECT.event (short)
How did [it*] happen? OBJECT.event.method (long)
→ why, where, who, when
it* referring to WHAT, WHO, WHEN, WHERE
"How did Paris happen" sounds strange, but one could reply, "a long time ago, there was this tribe…."
This is all IMHO as a non-native speaker.