Thursday is the pay-what-you can “Giggle, Giggle Quack”(detailed in the Advocate calendar) dress rehearsal at the Dallas Children’s Theater (they suggest a $10 donation). The “madcap musical”, which runs through July 25, is based on the children’s book by Doreen Cronin and Betsy Lewin. On Saturday, June 19, Cronin will autograph books following the 1:30 and 4:30 p.m. performances.