It's gotta be easier to somehow submerge the entire camp than to try and build a pool. The only question now is where to get the water from. Luckily you remember the Pacific Ocean is right nearby. Well, sorta nearby. Close enough you can probably dig a canal to it before the set needs to start. Armed with a shovel and perhaps a misguidedly optimistic approach towards the leave-no-trace principle, you quickly route the ocean over to your camp and submerge it in a good ten feet of water. This is enough for the minke whales who happily rock a set that's enjoyed by all. Tomorrow you'll have to restore the ecosystem as part of your teardown, but that's a tomorrow problem. For tonight, let’s just enjoy this great party.