Have you spent hours creating those programmes/fans? Did you create your own photo booth? Have you hand-crafted several ornate decorations that you plan to hang onto for several years? You'd be amazed at what people leave on site and forget to collect, simply because they think someone else has arranged to bring these keepsakes back.

Very often these things aren't noticed until you come back from honeymoon, in which case the venue may have unwittingly thrown them out. The best way to circumvent this is to not only give your bridal party a list of things you must have back from the venue, but make sure the venue coordinator has a list of this as well. That way, if anything gets lost in the shuffle your venue coordinator will know to hang onto it for you until you get back from honeymoon, or can make other arrangements for delivery.