Create a Timeline
Depending on how far in advance you're planning your event, you may need to set up a timeline that will help you meet your deadlines. For example, you should book the caterer well in advance -- even before you send out invitations -- and then contact them again right before the event with your final number of RSVPs. Make an outline of every decision and activity in sequential order from beginning to end. As you plan, visit this chart frequently to ensure you're staying on track.