In 2009 it began operating as a large outdoor venue for concerts, under owner Eric Suher's Iron Horse Entertainment Group; as of Summer 2018, it remains defunct with no events scheduled for the foreseeable future.

The Summit House burned down on October 8, 1900 and an even larger one was built, seven stories high to the top of its golden dome.

He expanded the midway with a new roller coaster called The Mountain Wildcat, a new carousel (housed in what used to be the dance pavilion), a Circle Swing (called Aeroplanes), Midget Auto Cars (bumper cars), Whip, Penny Arcade, Shooting Gallery, fun house, roller skating rink and games of skill.

It was replaced by a smaller all-metal building, but by then with trolleys disappearing and people driving to wherever they needed to go, the Summit House no longer was as popular.

Even so, Mountain Park remained open for over twenty years under the leadership of Pellissier until the Collins family purchased it in December, 1952.

Teenagers flocked to the park to hear the latest rock and roll acts and take a spin on the big rides.

Throughout the years, the park was modified and improved, with colorful art deco styling and brightly lit structures designed by legendary roller coaster builder Edward Leis and Rhode Island craftsman Dominic Spadola.

A young Hal Holbrook was part of the cast from 1951 through 1954 and returned to the Casino in 1957 to perform his one-man show Mark Twain Tonight!

[2] When the Valley Players folded, Nikos Psacharopoulos established an Equity company called the Casino-in-the-Park Playhouse in the theater where, with directors Ted Mann and Keith Fowler, he produced an artistically strong [3] but financially difficult season of plays by Shakespeare, Shaw, Brecht, and Tennessee Williams.

On June 11 of that year, a natural gas explosion leveled the Tap Room and Stardust Ballroom building while the Holyoke High School prom was taking place inside.

Throughout the 1970s, the midway stage played host to everything from soap opera stars to nostalgia acts such as Danny and the Juniors to bodybuilding competitions.

Butler recognized Schwarzenegger's stage presence and he and Gaines would go on to make Pumping Iron, a book and subsequent movie which introduced bodybuilding to the American mainstream.

[4] In addition to bodybuilding, regular wrestling matches took place at the Midway venue featuring Walter "Killer" Kowalski.

Bingo was a big attraction for senior citizens in the Clambake Pavilion every Sunday, as was popular polka king Larry Chesky, a Holyoke native, and his orchestra.

Collins advertised the entire property (with all the rides and equipment) in trade magazines for $4 million, but with the recession, there were no interested parties.

Few reminders of the park remained: the entrance to the Mountain Flyer, the decaying mini-golf course, the large blue picnic pavilion and one of the original stone water fountains.

Suher relocated the pavilion to where the center of the Mountain Park midway used to be, but it collapsed during a winter's snowfall and was never rebuilt.

In July 2009, Suher gave a series of interviews[7] stating in one that he wanted to return Mountain Park to the way people remembered it.

With the entire area cleared of debris and food concessions placed under the steel picnic pavilion, Mountain Park re-opened as a concert venue on Saturday, August 15, 2009.

Entertainers included Sonny Landreth, Johnny A, Naomi Shelton and the Gospel Queens, Rubblebucket Orchestra and Frank Manzi Band.

In 2010 the park continued to offer paid concerts in the summer, by acts like The Flaming Lips, Counting Crows, My Morning Jacket, Willie Nelson, MGMT and The Disco Biscuits.