After all good things said about civicrm my question is: Is it any possibility to allow participant after an event registration to change status or other information related to that event? I'm using drupal and civicrm. Help will be appreciate. Tanks
Normally it would be a civicrm user/ administrator that would update participant details after an event. (Rather than the participant themselves).
As Pete said you can configure a Drupal Webform to update participation details.
The answers to this question How do I get Retrospective feedback for an event using a Webform (participant Custom Data)?
Shows how someone else has configured a webform, and the webform url (including event id and contact id) for use in a schedued reminder.