They are connected to convention hotels. I don’t know about Disney, but It’s not unusual for convention vendors renting suites to host party’s for potential customers.
How many people are going to be there? I can't see Disney doing anything unless you are being disruptive to other guests or causing damage to the room.
As far as parking and such that is your call.
BWV you could have them park at HS and take the boat. I suspect though something like the Wilderness would be easier to park at? Not sure.