It's long been said that staying in is the new going out. Yet a few well-known newspapers, such as the Guardian and the New York Times, once said that the dinner party was dead. Along came the idea, though not really a revelation, to theme it. Theme weddings, theme birthdays, or just a decadent theme dinner party â¤“ why not? Nothing beats dressing up in your fanciest outfit and be treated with even fancier meals, courtesy of wonderful catering services.Is staying in still the new going out? London plays host to just about every type of venue imaginable, including dining on a boat, barge or yacht. Theme party venues are prolific; choose anything from a speakeasy to a vault. But hiring a venue for a private party isn't cheap. Add to that the cost of food and drink, and that special dinner party just got seriously expensive.