Hi Jessica and thanks for following up!
Yes, Advanced Custom Fields does indeed allow you to add that field directly to the event post editor in WordPress, so you would be able to see the field when creating a new event. No editing files necessary, the field will be right there. π
As far as displaying the information you put into that field onto the event page itself, you can follow the Advanced Custom Field examples for how what needs to be added to the calendar template, then check out our Themer’s Guide for how to override theΒ single-event.php file, which you can use to display that field on the single event page.
Please do let me know if this helps you get started!
Geoff