Depending on what decorating there is to domthenvenue may do it anyway, I know with my work we generally put out name cards, favours, centre pieces, cake & stand, even lit backdrops & table skirts, the only thing we tend not to do is the chair covers & balloons (if there are any) as the external company providing those do it on the morning, might be worth checking with your venue as it would save you the hassle x
