Theme_hook_suggestions not working
Drupal will not look for template overrides in custom modules, only themes.

If you really want to put a template override in a custom module see the answer to this question.

Extra notes are:


Make sure to handle punctuation and any other undesirable characters in your field value.
field_get_items() is a better way to get the value of a field from a node.
It is generally best to keep your template suggestions in line with what is already there. For example starting this suggestion with 'node__' followed by your custom stuff, like maybe 'node__event__' . $field_template_list or something like that. It makes it easier in future to know what kind of template it is.