Set those alarms and get those clicking fingers ready: Starting tomorrow, pre-sale tickets for this year’s Virgin Mobile FreeFest will go “on free” tomorrow beginning at noon.

This year’s outing—which will feature Vampire Weekend, Icona Pop, The Avett Brothers, and Mr. “Blurred Lines” himself, Robin Thicke (as well as a smattering of other EDM and pop acts)—will take place on September 21 and, as always, will be held at Merriweather Post Pavilion. Tickets can be purchased here.

And if you miss out on tickets tomorrow, fear not, the regular tickets will be “on free” again on Friday at the same time.

Oh, and here’s a video Robin Thicke performing “Blurred Lines” with Jimmy Fallon and The Roots using only toy instruments. What is it about that song and kids?