See an example at…
http://www.signupgenius.com/go/30E0E49A4A62AAB9-light
This is a sample online sign-up form for a prayer initiative we’re staging in August at the church in which I serve as Missions Committee Chairman. SignUp Genius made it relatively easy to prepare an online location for collecting all the names and data we needed to stage the event. It’s free (well, ad-supported), but I was able to “buy out” the ad for a very small sum.
EventBrite also does this. Likewise, it is free unless you are selling tickets, ex. charging admission to a movie night.
Forgot to add the link to EventBrite:
http://www.eventbrite.com