We have a Mautic Trigger node which supports all events Mautic supports (we query the Mautic API itself to get the list). So if it is possible on Zapier I would say it is also possible in n8n.
Here is also the identical list on their website:
I am no Mautic expert in any way. So no idea what event they would send when a new contact gets created. Maybe it is either part of “Contact Identified Event” or “Contact Updated Event”. So would be a better question for the Mautic forum than ours. Additionally do I have to say that the events seems somehow very unreliable. Every time I test it seems very random if we actually get informed on an event or not.