free events

Hi,
the NGO I work for is organizing a free conference, and I am currently evaluating COD to see if it suits all our needs.
The main requirements are:
1) the conference is free, so the word "ticket" is banned from the site
2) during the registration process, attendees have to enter a few personal data like first name, last name, address... (this can be solved using Drupal built-in user profiles)
3) the conference will be a two days event, and we need to know if each partecipant will attend on both days, on the first day only or on the last day only