Training is everything in the dance world, and the chance for young hopefuls to hook up with seasoned pros is both rare and intensely valuable. So as you might imagine, the Summer Intensive program at the San Francisco Conservatory of Dance is the high point of the year for its enthusiastic (and exhausted) participants. “For four weeks, 55 advanced dancers ages 14 to 23 chosen by audition from the Bay Area and beyond forked over (or their folks did) $1,800 tuition to study with some of the best in the business — the business of artistry.”