Good evening Jonathan and welcome to the Events Calendar Support forum!
Thank you for reaching out to us.
We will gladly try to assist you on this topic.
As a first step, I would recommend reading my colleague Geoff’s great post on a related topic.
To make a long story short, I would really advise against trying to modify the date format within the plugin itself. This is likely to cause some pretty serious issues.
But, as the post suggests, you can absolutely customize things, including the format of certain values in a very specific context (leaving other views and context untouched) using the instructions contained in our Themer’s guide.
Let me know how that goes.
Best regards,
Geoff B.