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

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