Hey @Simon,
This is possible only via code-customization at this time. We unfortunately cannot help with custom code.
However, our support engineer Nico once shared a snippet of code that sends an email to the “organizer” of a community-submitted event. You can find that snippet in this thread → https://theeventscalendar.com/support/forums/topic/send-event-organizer-an-email-after-event-submission/
I would recommend starting with this snippet and then hacking/tweaking it to sent to the email addresses you would like, with the attached documents you need and such.
I’m sorry that I cannot delve into much more detail here, but I hope this helps you get started!
If you’re not familiar with custom coding and need to hire someone to complete these customizations for your site, then one resource that may be helpful towards that end is this list of customizers that we’ve compiled here → http://m.tri.be/18k1. We have no affiliation with any of these folks, they’re simply some well-respected names in the community that are to handy to share in situations like this one.
Cheers!
George