Tesla is cutting its board down by more than one-third, to seven directors, by 2020, a move that includes the loss of some of CEO Elon Musk’s early advisers and allies, according to regulator filings posted Friday. The filing comes days before a busy week for Tesla that will include an April 22 event meant to highlight its progress with autonomous vehicle technology, its April 24 quarterly earnings call and a hearing with a judge to determine whether Musk and the SEC were able to reach a resolution contempt of court request over his Twitter use. Longtime board member Brad Buss and Linda Johnson Rice, who joined two years ago as an independent director, will not seek re-election this year.