With Jennifer Palisse I gave a talk called "Is this your card?" during Science Week in 2018. It was all about some of the maths of magic tricks, mostly card tricks. It was really popular so we'll rehash it pretty often, and we're also putting it into workshop-form for high school students.
Here's the first version of the talk from Melbourne uni's Science Festival in 2018. Prizes and food were supplied by ACEMS .