For its first two years, Bayou Cirque mostly has been a collection of acts performing at festivals, corporate events and downtown concerts.

  But when Bayou Cirque’s “Dark Circus” takes the stage at the Manship Theatre at 2 p.m. and 7 p.m. Saturday, Sept. 28, it will be a watershed moment — a stand-alone show to see if the public is ready for Baton Rouge’s first and only circus troupe.