You pass liability downstream by having members of the group sign a waiver, essentially accepting those same risks and responsibilities. You could use the activity waiver (available on the CDD site) or reference the waiver for the woodshop. In some cases it's sufficient to post or provide the group by-laws and active participation is acceptance but getting a signed release is always best.
Residents required to sign waiver absolving Villages of responsibility for injury!
* not legal advice
*