By Josh Stillman
December 13, 2012 at 10:53 PM EST

Move over, 12-12-12 — there’s a new star-studded charity benefit in town.

Tonight, the What’s Trending YouTube channel will host the First Annual Tube-a-Tweet-a-thon Holiday Spectacular. Notable guests include the popular online a cappella group Pentatonix, actor and comedian Kevin Pollak, and Snoop Lion. Proceeds from the event go toward Covenant House, a charity that supports homeless youth.

The program airs tonight at 9pm ET. You can watch the promo video after the jump.

In case you missed it, here’s the full lineup:

Pentatonix, I Justine, Kevin Pollak, Pia Toscano, Snoop Lion, The Gregory Brothers, Cimorelli, Hannah Hart, Grace Helbig, Taryn Southern, Chester See, Bree Essrig, Lisa Schwarz, Steve Greene, Jason Horton, and Emma Caulfield.