Full Moon.

Scenes From Friday Night's Walk the Moon and Family of the Year Show at Trees.

“Thank you all for being weird with us!” shouts Nicholas Petricca, frontman of Walk the Moon, just seconds before launching his band into their “Anna Sun” at Trees on Friday night.

After the song finishes, the lights in the room abruptly go off and the band walks off the stage. But the curtains don't close — there's more show to come.

The crowd begins chanting “Encore!” impatiently.

In a few minutes, Walk the Moon returns. It's a brief encore. The band just plays one song: “I Can Lift a Car.”

Petricca makes sure it's a cathartic one, though. He asks the crowd to raise their arms above their heads and imagine all the bad feelings rising out of them through their veins and fingertips.He only wants happy thoughts during this song, he says.

Surely, however, that's all that filled this room anyway. The venue was packed. The audience was dancing all night — opening act Family of the Year made sure of that, what with their folky style. Both bands' sets were pure fun.

That much was clear all night long.