Planning a Holistic Community Event

I am thinking about creating an event in my community that would showcase the local holistic businesses. I know there are other "Holistic Fairs," but I am wanting one just specific to our local community.
Does anyone have any ideas on how to get started or if it's a good idea. I have never been involved with planning events or getting sponsors . . . and all else that I am sure is invovled with planning something like this.
I have been thinking about this for awhile now and am thinking more and more that it's just what our community needs. Any thoughts or ideas would be greatly appreciated.