Dori Tarakan of Roslyn, is a self-described Harry Potter nerd — and she was so eager to see the new J.K. Rowling movie “Fantastic Beasts and Where to Find Them” that she volunteered to dress as a witch and work at a sneak-peek advance screening of the film on Thursday night.

While the film officially opens Friday, some theaters on Long Island offered showings on Thursday night, including the Soundview Cinemas in Port Washington, where MomTime Events threw a party for teenagers and a showing. Tarakan, 29, was staffing a table set up by Sylvan Learning Centers.

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The new flick, with the screenplay written by Rowling, is named after a Hogwarts School of Witchcraft and Wizardry textbook of the same name written by the fictional Newt Scamander. The movie takes viewers back to 1926, when Scamander arrives in New York City with a magical briefcase — open it and enter a world full of magical creatures.

It introduces new characters — no Harry or dare-we-say Voldemort. That didn’t worry Potter fan Zach Hay, 13, an eighth-grader from Sands Point. He just likes anything from the wizarding world.

“Just the whole concept is interesting,” he said prior to the screening. “I’m excited to see it.”