The interim CEO of Sun-Times Media Group has sent his 1,800 employees a memo telling them that even if September 29, Tuesday, isn’t a a formal deadline, it’s still pretty damned important. Jeremy Halbreich had been saying that Tuesday was the day by which all the STMG unions had to sign off on terms demanded by James Tyree, the financier whose investment groups has bid on the company. But then the bankruptcy judge in Delaware said differently.