A Joan Crawford melodrama that few people alive have seen, an early Christopher Nolan stunner and the behind-the-wheel inspiration for Ryan Gosling’s “Drive.” August is a good month to live in Los Angeles and go to the movies. The repertory scene continues to offer up an avalanche of riches, with local programmers outdoing themselves. These screenings feature special guests, archival prints and other surprises. Consider our guide a handy catch-all of the best repertory screenings of the month, reserved for older films playing in unique circumstances.