If you have a batch of event tickets that were purchased at a certain price point and enter the system as such, you can query for these transactions and then go in and do a mass update that marks a percentage of each amount as not tax-deductible, since by law if there are goods and services exchanged, (such as food or beverage at an event,) a portion of the ticket price must be marked as not being deductible. 

Given this is not an option, I'm currently faced with manually entering a non-deductible amount in over a hundred journal entries in order to provide an accurate tax receipt.