To dream that you are planning an activity or event indicates that you need to be more organized and methodical in your decision-making and other aspects of your daily life. There are some issues that you are trying to sort out. Alternatively, the dream may reflect your actual stress or concerns about the activity or event in real life.
Dreams can help you solve certain problems that you are stuck on. The solution to a problem came about in a dream for some inventors and scientists. Some authors look to their dreams for their novels. Thus dreaming of a plan may give you an answer to a problem you are having.
If you dream of having plans or making plans, then it means that you need to make a commitment and stick to it.