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A bit confusing since your profile says you are running "Standalone" and NOT Drupal ? This post is about using the Drupal Calendar - which definitely requires that you be running CiviCRM inside Drupal.
is civicrm in a different db than drupal?
what exactly did you put in the file? by the looks of it you have written something incorrectly.i honestly can't remember exactly right now, but i believe correctly configuring that line is what worked for me when i did this with 2 separate databases.the other way you can do this is to merge your DBs. obviously back up and test this before doing it on your production server.
welp that is obviously not fixing it. as far as i know, that line allows you to switch between dbs. but it's a table prefix in drupal which is why you were getting those errors (if you read the errors, you see it's using that entry to prefix your drupal tables directly). so don't do that. it must not be related (it was just a guess, as it wasn't working in my setup without it). i did get this working in 2 dbs though. however, all the other people who have gotten this working have merged their dbs. so i suggest you give that a try. or else someone who is more skilled and not sick with a 104 degree fever can chime in as i'm not exactly in my right mind today.