With Tony nominations around the corner, the musicals Titanìque and The Rocky Horror Show have extended their limited Broadway engagements into the fall, with Titanìque now continuing performances through Sunday, September 20 and Rocky Horror now selling tickets through Sunday, November 29. Rocky Horror had been set to play through June 19, and Titanìque was to close July 12. Both shows have been doing well at the box office, especially Rocky Horror , which has been selling out Studio 54 with weekly grosses often well in excess of $800,000. Attendance at Titanìque at the larger St. James Theatre has been in the 86% of capacity area, with grosses steadily increasing in recent weeks, with the most recent figure at $790,760. Both productions arrived on Broadway this spring and are likely to land Tony nominations in significant categories on Tuesday, both for the productions as a whole and in performance categories.…