...
How to get volunteers
The Five Stages of Open Source Volunteering http://dirkriehle.com/publications/2014-2/the-five-stages-of-open-source-volunteering/
Sourceforge Help Wanted https://sourceforge.net/p/forge/helpwanted/
Open source projects on GitHub that need your help. https://www.codetriage.com
Python Volunteer Oportunities https://wiki.python.org/moin/VolunteerOpportunities