The Mark Morris Dance Company came to the Tryon Festival Theatre at Krannert on May 1 for a two-day run of their appealing and inventive version of George Friderik Handel's 1718 (rev. 1739) pastoral opera, "Acis and Galatea." This was a festive occasion in that the Krannert Center is one of the presenters of this production, and the chorus members were from Baroque Artists of Champaign-Urbana (BACH), and the pit orchestra players were from the Sinfonia da Camera. The conductor was the celebrated specialist in baroque music, Nicholas McGegan.