Start is with your ceremony time then you will work backwards.
Once you have worked your way from Ceremony start time back to the time you first get up, then you go back to your ceremony time and work forward to the end of the night when vendors have to be out by.
Be sure to add all special events such as your grand entrance (after ceremony, if you’re having one, any toasts, first dance and family dances, cake cutting or dessert service, etc.
After all special events are noted, go back to add in finer detail.
Transportation times and “buffer times” are to be noted and accounted for.
Personal floral like bouquets and boutonnieres