Question: When did the musical in which Lauren played the role of Miss Honey have its trial run at the Stratford-upon-Avon theatre?  
Sentence (from "Matilda the Musical"): The musical's narrative centres on Matilda, a precocious 5-year-old girl with the gift of telekinesis, who loves reading, overcomes obstacles caused by her family and school, and helps her teacher to reclaim her life.
Relevant evidence: No