Inside the Oak Tree

While looking for a picture to be taken for his upcoming Photograpy cluub event, a teenage boy discovers an abandoned building while taking a short cut. Inside the building, a tree can be seen from a distance and in front of that tree is a small shrine and few lit candles. As he takes a picture using his old phone, all it took was a hollow entrance inside the tree with no shrines and candles to be seen. He took the courage to go inside and suddenly bright lights shine, 'a festival? but no one is even here?'