Hi, @shellyscott !
I've moved your post to our Design board so you can receive a better response from our community.
While I understand you would prefer to modify code as opposed to using an app, if you only need this feature for a short time, the app MagicPass has a 30 day free trial!
While I understand that most people prefer apps, I don't as a business owner I want the ability to not have to pay for an app "for a short time" especially when I will be employing this feature for future events. So thank you, I am looking for code help it surprises me that shopify doesn't offer more support for this.