The must-have condition of the environment of an online community that a community manager should create if they want users to become volunteers is to make it so it is safe for volunteers to make mistakes.
Never criticize or give your personal assessment of the initiatives volunteers propose. Volunteers are not professionals; it is fine for their initiatives to look amateur. You need to give volunteers the opportunity to try whatever seems appropriate to them. There is only one case when it is worth asking volunteers to postpone launching an initiative, when the initiative is outright harmful to the community. If you can make volunteers enjoy working on their initiatives, it is already a win.
This is a fragment of a draft of the book “Lessons Learned While Working On Stack Overflow”. Read the full book on kindle or the paperback version.