Hi John good to hear from you! I think Ryan’s suggestion above is a good way to go. That would be portable and give you the expandability required.
If you’re looking for another option, something I’d recommend is the Community Builder plugin for Joomla. This would work well if you wanted to enter everything on a database on a site. Community Builder lets you add each entry for your show and record all of that person’s information – name, address, car, etc etc etc. This is all then stored in a database and you can then sort through the database and retrieve entries later. Moreover, for those people who have email addresses, you can mass email all of them about the show. The only caveat of this is you have to have an internet connection to access it. Also Community Builder and Joomla are both free.