Nice movie but a sense of missed opportunity

It's a nice movie but for someone who read a lot about Woodstock the experience felt incomplete in the movie. The director did a decent job with the movie set and mentioned interesting facts about the safety issues at the event and the leg injuries (the most common type of injury in Woodstock) but didn't elaborate on them. Also, it seems that the director tried to idealize the participants (the hippies) in the event, although I am not sure that he succeeded.

3 main problems:

1. Maybe the main problem, the director decided to completely ignore the performances themselves. We only watched Woodstock's backyard and not the main event.

2. Two people killed in Woodstock, some suffered from overdose, but these cases absent from the film. One of them was a Vietnam solider, I believe the character Billy (returned Vietnam vet) is inspired by him.

3. Lee miss the irony of anti-war activists in Woodstock receiving medical assistance and food from the U.S. military, including from a helicopter returning from fighting in Vietnam.