The general consensus around party buses is that they are meant to be places where you can have a bit of down time that can recharge your batteries but in spite of the fact that this is the case it should always be noted that they are transportation vehicles first and foremost at the end of the day. It is important to note that party buses can be used to take you to a lot of places, and if you are in Washington DC for the weekend you might want to hire one to take you to the Capitol building.
Everyone knows about the Capitol building. It is the building where the senate convenes and decides on what legislation will be passed and what will be left on the cutting room floor, and it has played a central role in American politics for well over two centuries now.
Washington DC party buses often add this building to the route that they end up taking anyway, so you might not even need to put any significant effort into this sort of thing after all as you might get the chance to see it regardless of anything else that might happen along the way.
Seeing this building will probably fill you with a huge sense of patriotism and a newfound respect for this republic that we are all living in. You can see it with a huge group of friends too since party buses are a great way to move large groups around and many would even say that they are custom built for this sort of thing as well which makes them perfect for the kind of use you have in mind.