This question became urgent this week when
my autumn roundup of performing arts events went to press on Thursday evening
for Friday’s paper. The “fact-checker” (I put it in scare quotes as the title
is itself redundant: if something really is a fact, it obviously doesn’t need
checking) altered many of the dates in my piece. Why did she do this? Because
she had checked the theatre websites online, and found that many if not most of
them claimed that the play began before the date I had given in my copy.