Define your objectives. These need to be realistic and in writing. Pick a date that works with the most people. For more information on booking a training date, see Tips on Booking a Training Date. Don't try to cram too much information into one day.
People have a built-in information tolerance level.
Arrange for people to have freedom from daily workloads. People should be able to attend all training sessions without being called out to solve problems. In addition, if people have to work overtime to compensate for time missed due to training, this takes away from the effectiveness of training. Don't try to pace the course too quickly. Allow enough time for questions and exercises.