In a world submerged in the hysteria of social media, photos and videos of wedding ceremonies and parties are sent whirring round the globe even before the fun is over for the night. Hosts today want to have control of the images that are out there. Also, they don’t want some budding David Lynch getting in the physical way of the official videographer. There is nothing wrong with gently advising your guests that using their phone is inappropriate at this time and to respect your request. Even frame the sign beautifully and make it a feature of the decor. Class.