Jimi Hendrix was the last performer at the festival but that wasn’t the original plan. Original set up wanted Roy Rogers;
https://www.washingtonexaminer.com/woodstock-producer-roy-rogers-not-hendrix-could-have-closed
Almost never mentioned in the history of Woodstock is who brought in the food. A group of nuns are credited as supplying some, but a large amount of it was brought in courtesy of the New York Army National Guard.
Hendrix wanted to be last. They tried to talk him out of it thinking no one would be left. Hendrix paid his back up members 500 bucks each.
The military helicopters brought in doctors and medics who worked for free.
On PBS, they showed a list of medical ailments that were treated. Everything you can think of, from a raccoon bite, to eleven rat bites, from issues dealing with pregnant women, people with pneumonia, etc.
A tan-colored civilian helicopter brought in tons of food.
The good people of Bethel, N.Y. and other communities heard that “the kids were hungry” and they cleared out their cupboards. The documentary showed interviews with older people....middle-aged and above....who said they believed in helping strangers in need.
It was an egg producing area, so the local farmers put out the word and gathered up 400,000 eggs, hardboiled them, and sent them over by helicopter to the music festival.
There was no mud on Friday and Saturday; that happened in the aftermath of a massive squall that went through the area on Sunday and caused one helluva mess.