When did you arrive?
Here is a breakdown of every ticket scanned at the Youtopia gate in 2015. Green times were when the gate was open and red was when it was officially closed.
The first day on the plot, October 14th, was for the 16.7% that had early entry approval because they were building or volunteering. Of those with regular entry, 55.0% showed up on Thursday the 15th and 39.5% on Friday the 16th.
One interesting thing is that Thursday skewed more heavily toward the morning, while Friday arrivals were mostly after 5PM. For those working M-F, this means that most people either took 2+ days off work, or zero vacation days.
Finally, Youtopia 2015 averaged only 1.9 people per car. We can do better.