It would be helpful if the appearance or requirement of an event question could be conditional on a previous question.  For example, we want to ask which day of the National Relay the participant will be walking. Then, based on the participant's answer, we want to then ask which specific leg of that day are they walking. 

Another example might be that the organization gives a choice of whether or not a participant wants a t-shirt, then if the answer is yes, it will ask the t-shirt size (but not ask for the size if the answer is no).