It has already been a difficult year for movie theaters, with the North American box office down roughly 20 percent from last year. And that was when actors could promote their films.With SAG-AFTRA, the actors’ union, on strike as of Friday, its 160,000 members are officially barred not only from acting in projects involving the major Hollywood studios but also from engaging in any publicity efforts for films and TV shows that have already been completed.That means no appearances, either online or in person, including at the Comic-Con International next week in San Diego, many of the fall film festivals, and any movie premieres or television promotional …
