What is an activity?
Activities are the building blocks of Duelbox. There is no limit on the content of an activity, e.g. you can have unlimited number of questions in a quiz. In One-time plans, activities are priced per event (show), so that you can use them for up to 3 days long without limits. See activities here.
What is an event or show?
We call the arranged and configured activities a show. One show usually represent one real-world event. You can have as many activities in a show as you like. In One-time plans you can configure a show anytime before the event, and use it up to 3 days long on the event.