Va. Code § 24.2-203
The electors shall convene at the capitol building in the capital city of the Commonwealth at 12:00 noon on the first Monday after the second Wednesday in December following their election. Those electors present shall immediately fill, by ballot and by a plurality of votes, any vacancy due to death, failure or inability to attend, refusal to act, or other cause. When all electors are present, or the vacancies have been filled, they shall proceed to perform the duties required of such electors by the Constitution and laws of the United States.
Electors selected by the state convention of any political party as defined in § 24.2-101 shall be required to vote for the nominees of the national convention to which the state convention elects delegates. Electors named in any petition of qualified voters as provided in § 24.2-543 shall be required to vote for the persons named for President and for Vice President in the petition.
Va. Code § 24.2-203