Several days before a significant royal wedding, crowds start camping out around the wedding venue, reaching critical mass on the morning of the big day – with plenty of flags, picnics, patriotic umbrellas, pop-up tents and fancy dress on display. Around one million people turned out onto the streets of London for William and Kate's big day in 2011, and William and Harry went on an impromptu walkabout to meet some of them the night before the wedding.