Plugin Required for Exhibitors

Hi,

I was wondering if anybody could help me. I have an events website to make for a festival and I have found a brilliant theme to use that enables me to put sponsors, speakers etc up on separate events. But there is one thing missing, one of the events is a conference and trade show. So I need to upload speakers and exhibitors, but the theme does not have the function to do both.

Can anyone recommend a decent plugin that would be good to upload exhibitor information? And that can be laid out in some sort of alphebeticalised list or grid??

thanks