[EXCLUSIVE VIDEO] Shadowhunters Superfans Get A Festive Treat

Remember that time when the ultimate superfans got to meet Cassandra Clare in NYC? And then the lucky 11 got an advance copy of Lady Midnight? And if that wasn't enough they also got to meet the Shadowhunters cast?! Well you can catch that magical event on ABC Family tonight!

Check out this sneak peek of what's to come!

The fan girling was real!

Tune in to National Lampoon's Christmas Vacation between 9.45pm-12.00am ET/PT to see the superfans being surprised in full!

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