Make Public Sign Ups
It is easy to allow people who are not in your directory to volunteer for the sign up.
When you create a new sign up or edit an existing signup in “Volunteer Sign Ups” module, simply un-check the “Make this sign up private” in Step 1. Now you can share the sign up link with anyone! Simply copy the URL of the sign up from Step 4 and email it or post it on social media.