I would confront them (in a respectful way) and explain that while you understand and can appreciate their concern, from about 2pm to 4pm tomorrow, you cannot give that to them. The other 22 hours of the day, they can have it their way. I think they're actually getting a hell of a deal on that one. You get 2 hours, they get 22.
Last year my neighbor living next door actually called the police because she heard yelling and screams coming from my garage. The police knocked on my garage door (where I do all of my SU watching - man cave complete with 90" screen w/ projector, leather club chair and stocked fridge with various samplings of brew). I opened the door quite surprised to see a couple of cops. When I explained what had happened in the game that led to me getting so excited, the one cop just chuckled and left without even telling me to keep it down. My wife still makes fun of me on that one.