"Sign up sheet" plugin???

I am working on a site for a church. They need a page that can host multiple “sign up sheets” with a defined number of spots. For instance… you could have 10 available spots for a bake sale, 8 available spots for chaperoning a youth trip and 5 spots for daycare volunteers. The idea being tha as people sign up for a spot, there is one less spot available… until, obviously, it becomes full. I need a plugin that dies something aimilar. Anybody got any ideas? Thanks in advance.