As much as I hate to admit it look on Fecon's website. It they are there it is usually a pretty good show. There is one in Ky that is outdoor's and has live demo's, I doubt mulchers but live stuff anyway.
The National Farm Machinery Show is indoors in Louisville, KY next week. They will have some of what you are inquiring about, but the August outdoor show will have more in that line. However, the NFM is huge and there will be dealers there that have both as well as manufacturers. Here is a link to the website: National Farm Machinery Show You can click on the exhibitor link and it will provide you with a PDF file that lists the exhibitors by building. It is worth a visit just to see everything that is available.