Yes, you can both vote in members to fill vacant Director-at-Large positions and vote in board members to fill vacant officer positions on the Executive. This cannot be done at a regular board meeting, but rather at a Special Meeting called specifically for this purpose (we recommend holding it right before your regular board meetings for simplicity).
Notice of a Special Meeting must be given a minimum of fourteen (14) days and a maximum of thirty-one (31) days beforehand to all sitting members of the board, with the purpose of the meeting expressed in the notice. Quorum must be met to proceed.
Voting must happen with secret Yes/No ballots. Voting that occurs by hand count or verbal calls would make the results null and void.