In order for the Calendar Base extension to appear in your Fronted, you will need to two Static Templates to the Extension Template Record (alternatively, they can be installed in your site's main Template Record. The two Static Templates required by the Calendar Base extension are:
default CSS-styles (cal)
CSS-based tmpl (cal)
Internet Link:
Instructions for adding the Static Templates can be found in the how to at: http://webempoweredchurch.com/support/howtos/single/add_a_static_template.