This party planning checklist will walk you through the entire process, from pre-event project management to when guests arrive. Planning an event doesn't have to be stressful; it can be enjoyable if you use our free party planning checklist to stay organized! Whether you're throwing a milestone anniversary, a special birthday, or a seasonal party, the more preparation you do in advance, the more free time you'll have later to enjoy the fabulous party you've put together. The time you spend planning your party depends on the size and formality of the event, whether you are inviting guests from out of town, and potential date conflicts. We recommend starting at least four months in advance for less stress and a good turnout.