Well, generally the crowd is younger teens/20 somethings..
You may get the occasional 30 plus crowd or a parent with say, middle schoolers..
But be prepared, for hearing vulgarities, interesting shadow effects with a sheet, being screamed at VIRGIN!, and well, other things...
Its wild crazy, and not for eveyrone...really you would stand out more if you DIDNT dress up or bring some props...
Props could include: water guns, rice, toast, croutons, toilet paper, newspaper, umbrella, playing cards, bells (like sleighbells), keyring, lighter, flashlight, glowstick.... there are others but that is what is coming up off the top of my head...