How do I categorize event fees for weekend festivals and markets?

You've come to the right place, @brettalanchamber.

All of the basic expenses necessary to run a self-employed business are generally tax-deductible. This includes the fees and some other miscellaneous expenses you've paid to events you've attended that are related to your self-employed job or business. You can categorize it under Schedule C: Other business expenses.

You can browse this article for a more comprehensive list of Schedule C categories available in QuickBooks Self-Employed: QuickBooks Self-Employed Schedule C Categories breakdown.

Also,  I'd recommend consulting with your accountant so you'll be guided accurately categorizing taxable income and expense transactions. 

Please don't hesitate to leave a reply below to keep me posted if you have other questions about managing your transactions in QuickBooks Self-Employed. Thanks!