From the earliest days of amusement parks, big name musical acts have been a huge draw giving the crowds an opportunity to see a great show. Whether it was John Phillip Souza and his band playing at the turn of the 20th century to boy bands playing today, parks have hosted these acts in an effort to draw crowds.

The early months of the season at Six Flags Great Adventure are typically a slower time of the year with most guests waiting until the peak of summer to visit when schools are out. To help boost attendance, the park often schedules concerts and other special events to try and draw larger crowds. Perhaps the best example (or worst depending on your point of view) of this occurred in May of 1981 when Great Adventure hosted the Marshall Tucker Band which drew crowds beyond anyone expectations.

The Marshall Tucker Band was a pioneering "Southern Rock" band that came to prominence in the 1970's.  In 1981 the band was recovering from the loss of one of their founding members in a car accident just over one year before. 
  Traditionally southern rock acts are not big draws in the northeast, so rather than playing a big venue in New York City or Philadelphia, they would often book somewhere like Great Adventure. Quite often southern rock or country acts would draw very large crowds to Great Adventure, being one of the only venues in the area that would host them playing to their dedicated fans which would make the trip to the park from miles around.

Often these acts were booked in all the Six Flags parks and since most of the parks at the time were in the south, those parks knew what to expect.  Great Adventure was  caught off guard by just how many people would turn out for a group that most of the staff wasn't entirely familiar with.  When an act like this was scheduled to play the park coupled with what turned out to be a great weather day, suddenly Great Adventure went from a slow spring weekend to a peak attendance day.    
  May 16, 1981 turned into the busiest day in the history of Great Adventure to that point with the park quickly reaching capacity.   Guest had to be turned away because there wasn't anywhere left to park in their lots. Traffic quickly backed up down the entrance road, all along Route 537, up onto I-195, and even back to the New Jersey Turnpike. Traffic was tied up for miles with nowhere for the cars to go.  Many park goers pulled over and abandoned their cars wherever they could find a place on the side of the road and walked into the park.

Being the shoulder season, the park was not up to full speed with staffing, pushing facilities to their limits. Making matters worse, park employees coming in for afternoon and evening shifts couldn't get to the park and those who were there were trapped unable to leave with the traffic jams. The local and state police came in to try and help alleviate the situation but it took a long time to clear the lanes for traffic trying to get past the park.
  The concert itself saw the Great Arena filled beyond its capacity with the seats and floor completely packed with guests.  Many concert goers were turned away at the Arena's gates and opted to climb the sloped grass walls of the stadium.  As a result, fencing around the base of the arena was added shortly after this event.

With that many spectators in the Great Arena, there were bound to be medical emergencies and the park's Security and First Aid staff coordinating with the local and state police and local First Aid squads took care of situations as they arose. 
  The Marshall Tucker Band concert at the Great Arena turned out to be the biggest day in Great Adventure's history to that point, drawing more than 50,000 guests which at the time was nearly twice what was considered a "moderately busy" day for the park.

Since the 1981 Marshal Tucker Band Concert, Great Adventure has limited the capacity of the park to a much more manageable number to prevent such extreme overcrowding.  This momentous event also prompted several traffic studies which developed plans to help prevent such wide-spread traffic backups around the park.