D.C. Mayor Vincent C. Gray’s office announced early Friday that a rally and march scheduled for Saturday has been called off because of Hurricane Irene.

The alert, delivered shortly after midnight, followed the announcement Thursday night that Sunday’s dedication of the new Martin Luther King Memorial has been postponed until September or October.

The Full Democracy and Freedom rally was an effort by DC Vote and Mayor Gray to put a spotlight on D.C. voting rights. That group was then planning to join a march for “jobs and justice” sponsored by the National Action Network.