I think we don't have a feature which supports feedback or reviews for an event. I think there should be a feature which will help organisers to get review/feedback from the people who attended the event. Attendees can give their review/feedback at anytime after attending event and It will help organisers to improve.
@sainiak009 yes, we need this feature, but it will not go into the first release version. More features also means more code to maintain and potential bugs. First priority is to get the system working in a stable manner and release asap.
@sainiak009 It would be great if we could collaborate on the first release features first.