These are suggestions for steps and the time it takes from the time you start your very first reunion. For someone organizing a reunion with a history, this list is also good for checking your progress or as agenda considerations for committee meetings.
If your family has a newsletter, include some of these steps from time to time. Family members can better appreciate what their part is, if they know what you need to do when. For example, they might return reservations and t-shirt orders if they realize your deadline date is not arrived at arbitrarily.
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24-18 months before your reunion...
Determine interest
Talk to other reunion organizers
Attend a reunion organizing class, workshop or conference
Start mailing list
Form reunion committee(s) and establish responsibilities and schedules
Keep records of everything
Develop budget and bookkeeping system
How to ask for money
Scout locations, facilities
Contact convention and visitors or tourism bureaus
Podcasts on this topic. 
Read about it.
