[Plugin – Usher Sign up Form]

I use a contact form called “slick contact forms” and you can enable it to tell you what page visitors are sending the contact form from – that would give you a good idea as to what night / event they’re interested in helping you with. Of course that wouldn’t take care of your “availability” issues but maybe you could use the wordpress ecommerce plug-in and treat every night like a different “product” – you could adjust the “quantity” and that could work as well. These aren’t the best ideas but I just know that there isn’t a pre-packaged plug-in for what you’re looking for so I’m trying to come up with the best solution for the issue so you don’t have to start from scratch on a personalized plug-in. I hope it helps.