Who the data from the incoming forms can be organised

Building the form is rather easy it seems.

Next I would like to understand, who the data from the incoming forms can be again organised on my computer,

and possibly made accessible to other team members of the festival.

I'm sorry but I didn't understand the question. Are you referring to form submissions and where it goes? 

If yes, form submissions can be viewed on your account. It is in the Submissions page. To view the submissions, please follow this guide: https://www.jotform.com/help/269-How-to-View-Form-Submissions

You can also add a sub-user to your account so they can manage your forms and view submissions. For more information, please check this link: https://www.jotform.com/help/232-How-to-Share-Forms-with-a-Sub-account-User

Don't hesitate to ask us anything if you encounter problems. We're here to help. Thank you.