Next month I got a big event, where people have to enroll themselves for. Normally I am doing this all by mail and putting them in an Excel sheet. Is it possible to do this automatically?
Use the form/spreasheet feature in Google Docs. It sets up a page for the enrollment, which you can make a short url on tinyurl.com for. When someone submits info through the page, Google automatically populates the spreadsheet with the information.
eventbrite.com best one i came across
There are plenty of apps to choose from. MakeUseOf must have profiled at least 10 such services in the past. Check them out below, some of them are extremely easy to use.
Mobaganda: Easy Event & Meeting Planner
SignAppNow: Create Online Sign Up Sheets
RSVPHere: Online Events RSVP Organizer
If you have Adobe Acrobat, you can send the invite out as a fillable pdf. YOu can create and distribute the form, have them return it by email to you, track the forms, and have the information automatically go into a spreadsheet. Can't make it much easier than that! (http://layersmagazine.com/distributing-forms-with-acrobatcom.html)
If you are using Google docs, you can create a form there, make it public on a website, and the data will go into a spreadsheet as well.
Just a couple of solutions for you!
there are multiple ways to do this. If all attendees had Facebook, you could invite them via Facebook and they could confirm their participation. However, it is better to use a system that does not require a signup or login.
Bookwhen offers free event registration management for up to 150 participants.
If you have more than 150 guests, I suggest Evite or Pingg.