Thanks for all the advice guys. Got a call from the HR today after I wrote up an outline for the whole event. They changed their mind
It's now all speeches and handing out rewards then off to the company cafeteria for crappy food.
They are using my warm-up game though where I give everyone a flag and they have to find the person with the matching one. Should be interesting with 180 or so people.
By the way, I wanted to suggest a giant game of Twister