DDR stands for day delegate rate," is, of course, the basic answer you would expect, while hearing your candidate go on to say things like "it is often the most cost effective way of booking hotels or venues for event planners as it is a per person cost" could mean bonus points.

Questions such as 'what is typically included in a DDR?' also give the candidate the chance to show their general understanding of professional event organisation, as there is no simple yes and no answer, but listing things such as room hire, water, buffet lunch, car parking, wi-fi connection and so on would show that they have dealt with such venues before, or could at least use their initiative to think about what a venue might be expected to include as part of its conference facilities.