Show Volunteer Events only to authenticated users

Sure - install an access control module.

http://drupal.org/project/Modules/category/74

e.g:

http://drupal.org/project/content_access
http://drupal.org/project/nodeaccess
http://drupal.org/project/taxonomy_access
http://drupal.org/project/tac_lite

but pick one that's well-supported

I've tried the first 3 and while the "access control" tab appear and you can configure it, it doesn't seen to change it since I can still view everything (event and event with timeshot) as an anonymous user. Taxonomy access will not work because events are not used as taxonomy.

for the taxonomy-based one you have to set up set it all up and then assign the term to the node.

These are standard modules - I assure you that at least most of those I listed will work if configured properly. The implementation of hook_access() in VT does not do anything funky.

Or here's another option:

http://drupal.org/project/simple_access

Thank you SOOO much!! I finally got it working with taxonomy access. I didn't understand the connection of taxonomy to nodes before so this is great help!