Unfortunately we can not provide support for custom front-end submissions.
Whilst we will often provide snippets of code to help users do something other then EE currently supports or point them in the right direction, the level of customization you need is not something we can provide for. To allow for this to work correctly you would basically need to re-build the event editor on the front end of the site which is by no means a simple task and beyond the scope of support.
I would recommend contacting a developer familiar with Event Espresso to see if they can help you with this, we have a list here:
The support post ‘EE4 – Front form to creat ticket’ is closed to new replies.
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Support forum for Event Espresso 3 and Event Espresso 4.