When you say “It's interesting about the numbers though. There were only an extra 3k punters, yet an extra 7k staff/performers?! How many people did Kendrick have on stage for his opening and closing again? Lol.” @MEGATRONICMEATWAGON there is something in this.
Glastonbury Festival stewards lost hundreds when they moved the camp outside of the fence, the replacements may have been younger and more keen to explore the late night entertainment. The extra 7k staff/performers may have brought a similar mentality. The demographic of the festival may have shifted to a younger working crowd and that could account for it being busier than expected. It would be interesting to see the data but no one has it.
The above isn’t based on any science, but I think the is more to it than scheduling and the crude number increase.