Event Calendar for Drupal 6?

First my apologies in case I did not look hard enough or in the wrong places but I spent a few days now trying to figure out the best way to have a calendar integrated in my Drupal 6 install... It seems that the calendar module is not supported for version 6 yet. I also looked at plenty of other php/mysql event calendar scripts but Drupal authentication is not supported and I do not want my users to authenticate a second time whenever they want to add an event to the calendar...A perfect calendar for me would be one that:* Displays a monthly overview showing on what dates events have been scheduled.* Every authenticated user can add/change/delete own events.* All posted events are visible to all authenticated users.* All authenticated users get email notification in case an event gets added/changed/removed.* When a day on the monthly calendar is selected, the view changes to the daily view with 1/2 hour increments.I am willing to buy a script or 'downgrade' to 5.x in case nothing exists yet on 6.xHope to get some good pointers :-)Thanks!

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