1969’s Woodstock was declared a disaster area at the time by New York Governor Nelson Rockefeller.
Organizers failed to construct fencing and ticket booths in time, allowing the site to be overrun by 400,000 people when only half that many were expected.
The influx of attendees to the rural concert site in Bethel created a massive traffic jam. Fearing chaos as thousands began descending on the community, Bethel did not enforce its codes.
To add to the problems and difficulty in dealing with the large crowds, recent rains had caused muddy roads and fields. The facilities were not equipped to provide sanitation or first aid for the number of people attending; hundreds of thousands found themselves in a struggle against bad weather, food shortages, and poor sanitation
On the morning of Sunday, August 17, New York Governor Nelson Rockefeller called festival organizer John Roberts and told him he was thinking of ordering 10,000 New York State National Guard troops to the festival. Roberts was unsuccessful in persuading Rockefeller not to do this. He was successful IOTL.
What if Sullivan County declared a state of emergency, as IOTL, but ITTL asked the Governor for help.