I have no idea how or where this might be implemented, and the only purpose for it would be to have fun. But, that's a good purpose for a lot of things!
I cannot be the first one to think, "boy, we should be able to get our butlers together for some high shenanigans!" They can dance, after all, and we have disco balls!
Granted, something like this would take them away from our streets, leaving them unattended. But a little sandwich board sign left in their places to explain where they've gone and for how long could take care of that. Then all you do is severely limit how often your butler could attend a butler party. Perhaps, once every two weeks?