(not much of an act if you go casually as yourself)
however wearing a corset and standing around with interesting makeup does not imo constitute an act.
*snickers* Don't let the living statues hear you saying that!
Now I have an image in my head of living statues being like the Angels from Dr. Who; they can only chase you down and beat you up if you aren't looking at them, or if you tip them
Edit: thought of new points to make!
1) Standing around in a group dressed up doesn't make you any more of an act; so I don't really see where you are going with this. Also, not everyone wants to be an act, some people just like to dress up, which brings us into...
2) Do you think that if someone isn't in an "act" that they should not be dressed up? This also requires a more defined definition of what "dressed up" means as the original question pretty much just excludes tee-shirts and jeans.
I am a drag queen, 99% of what I do in drag is standing around in pretty makeup talking to people, 1% is performing on stage. I consider myself, as a drag queen, more of a personality then a performer; which still falls into the category "act" but I am honestly closer to Paris Hilton (shudders) then Lady Gaga in that my musical career is a joke but people still like to mingle with me in all my fabulousness at clubs and events.
But, at the same time, I am 1000% in support of people who are not in "acts" dressing up, and just standing around not doing anything super exciting; because in the end, even a single person who put a little effort into their outfit can drown out 50 who didn't.