Being a concert promoter is a major responsibility since you're working for a musical (or perhaps speaking) artist to take care of practically everything. It's not far removed from being a movie producer who has to deal with everything from financing on up to being on the set during production.
For a three to five-month concert planning timeline, you'll take care of the things the artist has no time to do. These aspects are some of the most taxing aspects to living on the road. Nevertheless, with your outlining and know-how, you'll make this period of time more enjoyable for everyone.