calendaring

I am looking for the most recommended calendar module for drupal 6. This is for a non-profit that wants to display a master events calendar for the community. Have several users be able to update with events and everyone else just to view.

I have downloaded and tried a few, nothing really seems that good.

Looking for your input.

Thanks so much,

-JP

_{Edit by Michelle: This question has nothing to do with the chat module group it was posted into. Moving to what seems like a more appropriate group.}

I'm working on a couple of sites at the moment that are in this sort of area, and one of the key parts of them is going to be the availability calendar, so site visitors can see at a glance if there are rooms available or not. I've looked at the availability module and also the openresort module and while they are both going in the right direction, neither quite gets all the way there.