I like the way this is handled in the OpenStack Technical Committee:

Motions

Before being put to a vote, motions presented before the TC should be
discussed publicly on the development mailing-list for a minimum of 4
business days to give a chance to the wider community to express their
opinion. TC members can vote positively, negatively, or abstain.
Decisions need more positive votes than negative votes (ties mean the
motion is rejected), and a minimum of positive votes of at least one
third of the total number of TC members (rounded up: in a board with
8PTLs+5 that means a minimum of 5 approvers).

https://wiki.openstack.org/wiki/Governance/Foundation/TechnicalCommittee