NEW YORK — Broadway grosses inched upward during Week 21 (Oct. 14-20), rising by 2.6% to $14,943,519. Attendance of 236,359 was up by a similar 2.5%“Dance of the Vampires” got off to a bloodthirsty start at the B.O. The musical, which brings Michael Crawford back to Broadway for the first time since “Phantom of the Opera,” grossed a stellar $508,133 for its first five previews. The majority of shows saw minor declines. “The Goat,” which continues to post good numbers, was off by $3,536 to $249,335. “The Boys From Syracuse” closed at the American Airlines, gaining $13,441 for its final week and grossing $258,183. The 21 musicals grossed $12,937,178 for 86.6% of the Broadway total. Attendance of 197,516 represented 86.4% of capacity. The eight plays took in $2,006,341 for 13.4% of the Broadway total. Attendance of 38,843 represented 68.2% of capacity. Average ticket prices were $65.50 for musicals, $51.66 for plays and $63.22 for all shows.