Hold a quiz in a local pub or club for you and your friends.
Pick a date and time, and book a venue which can both accommodate your teams, and provide the necessary catering facilities.
Appoint a witty, confident quizmaster, with a few assistants to oversee the scoring. You'll also need a microphone or PA system and a CD/MP3 player. Keep a scoreboard - could be a flip-chart or whiteboard, for example - so that everyone can see who's in the lead after each round.
Confirm the quiz format - how many rounds? What themes will you have? Tailor the quiz to suit your audience, making it inclusive for those families from different cultural backgrounds. If you're running a family quiz, ensure that each round has a few questions that the children can answer. There are numerous sites offering quiz questions - try quiz-zone.co.uk or brainboxquizzes.co.uk.
Publicise the event as much as you can in the lead in up to it. Creat an event on Facebook, email your friends and colleagues and put up posters in the pub, club and local area.