Houston has a bit of Mark Morris fever. First, there was an art exhibit made up entirely of portraits of Morris by famous photographers like Annie Leibovitz. Tomorrow, it's the beginning of a two-day stint by the Mark Morris Dance Company at the Wortham Center. And later this season, the Houston Ballet performs some of his work. At today's Mark Morris at the Menil: A Conversation with Stanton Welch, fans will have the opportunity to see the choreographer off-stage and in a relaxed setting as he discusses his career, his recollections of onstage collaborations, and the state of the dance world with colleague Stanton Welch. 7:30 p.m. 1515 Sul Ross. For information, call 713-227-4772 or visit www.spahouston.org. Free.