While I was away, the Seattle International Film Festival announced that their opening night film would be Joss Whedon’s contemporary take on Shakespeare’s “Much Ado About Nothing,” and that Whedon would attend the gala screening along with cast members Alexis Denisof (a Seattle native), Amy Acker, Nathan Fillion, and Clark Gregg. Six hours later, SIFF announced that the opening-night event was sold out, in the biggest box-office success in festival history. Guess there are a few fans of “Firefly,” “Angel” etc. here, no? Let’s hope that “Much Ado,” which had good buzz at the Toronto International Film Festival last fall, is better than SIFF’s last venture into opening-night Shakespeare (Kenneth Branagh’s wan “Love’s Labour’s Lost,” in 2000). If you’re not one of the 3,000 or so who scored a ticket to opening night, you won’t have too long to wait: I heard today that “Much Ado About Nothing” will open in Seattle theaters June 21.