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A Los Angeles alternative to the upcoming Nebula Awards ceremony in New York on Saturday will take place at Dangerous Visions, 13563 Ventura Blvd., Sherman Oaks, at 2 p.m. that day. Past Hugo, Nebula and World Fantasy Award winners will attend, as well as crossover television writers. Authors Fiona Avery, David Beaucage, James P. Blaylock, Emma Bull, Michael Cassutt, Arthur Byron Cover, Sharman DiVono, Mel Gilden, Barbara Hambly, Brad Linaweaver, Vera Nazarian, Tim Powers, Alan Rodgers, Will Shetterly, Harry Turtledove and Katie Waitman will be on hand to sign their works. (818) 986-6963.

* For a change of pace, Dark Delicacies, 4213 W. Burbank Blvd., Burbank, will host a true-crime authors signing Saturday at 2 p.m. Private investigator Robert Scott will sign his books, “How to Identify Registered and Unregistered Sex Offenders” and “The Investigator’s Little Black Book 2,” and investigative reporter Dennis McDougal will sign “The Yosemite Murders.” (818) 556-6660.

* Singer-songwriter David Piper takes the stage tonight at 8 at Exile Books & Music, 14925 Magnolia Blvd., Sherman Oaks. $5 cover. (818) 986-6409.

* Television and radio personality Wink Martindale will sign his new book, “Winking at Life,” Saturday at 2 p.m. at Barnes & Noble, 4735 Commons Way, Calabasas, (818) 222-0542.