Allow episode admin form to also create/update associated artists and set times

[tubbo]

The episode forms currently have the ability to assign performances and artists by way of a multi-select <input> tag. However, this forces the administrator to have to add their data in three different areas before finally submitting the whole thing. It would be better if the administrator could add all of this information in at the same time, thereby allowing one form and one push of a button to synchronize data across all social media, and create events in Eventbrite and on YouTube.