"It'll be like magic! And it'll taste like magic markers!"
Sounds great! "Oh, and you know what would be really cool? If the swimming pool had this cool mist coming off of it, like in a music video. Let's dump a bunch of liquid nitrogen into the water! I wonder why nobody has tried this before!?!"
Here's a tip that's applicable both to corporate events and backyard pool parties: Do a quick Google search beforehand to make sure that nothing you're dumping into your pool has the potential to react and create a chemical warfare agent. If the party organizers had done this, they'd have realized what happens when pool chlorine and liquid nitrogen combine. The result is nitrogen trichloride, a toxic gas that will break up just about any party: