Thanks to Benjamin again, now we can add comments to the events / concerts that we have been. Multiple people can add comments.

For example, suppose you have been to one of the concert in the event calender at Marimba.org, simply display the event information and click "comments". Then, you can write whatever you want there.

If the event you have been is not there, you can still add the event to the calender retrospectively and add comment to it.

Enjoy!

Nat