Considering Zwifts vast array of virtual race planning options, what are the key factors that differentiate a well-designed virtual event from a poorly designed one, and how can these factors be quantitatively measured to improve the overall racing experience for participants? Are there any specific metrics, such as course design complexity, event duration, or participant density, that have a disproportionate impact on the perceived quality of a virtual event, and if so, how can these metrics be optimized to create more engaging and realistic racing experiences?