Seventeen year old Ryan Paolucci sent the invite out to more than 900 people on his Facebook page.
The flashmob was called "Storm the Millennium Party" scheduled for Friday at 10 p.m.
Cheektowaga Police say Paolucci planned for people to storm the hotel.
Paolucci's Facebook page was littered with explicit language of how people were going to cause damage to the hotel.
But an anonymous tipster contacted police and Paolucci was arrested Wednesday morning.
The hotel was unaware of the plot. Investigators are now combing through Facebook, contacting everyone involved.
The hotel has hired extra security just incase folks show up. Paolucci is charged with several misdemeanors including conspiracy, criminal nuisance and disorderly conduct.
He was released Wednesday pending a future court date.
Police plan to patrol the hotel Friday night. Anyone caught in connection with the flashmob will be arrested for trespassing.