Campfire

At Camp Half-Blood, at around 8 o'clock, all the campers gather around and sing campfire songs. The Apollo cabin mostly leads the campfire songs such as one song where they sing how their grandmother dresses for war, pointing at different body parts for the different pieces of armor. The campers sacrifice a portion of their food to the gods by the fire.

The Lightning Thief
When Percy first arrived at Camp Half-Blood when he is at the campfire, he sees a little girl tending the fire but nobody notices her. When Percy returned from his quest, the Ares Cabin showed him a burial shroud they had made for him in the event that he died. However, because he made it back safely they burned it in the campfire (something Percy enjoyed doing). Percy's and the other campers passed around s'mores while the Apollo campers lead the sing-along

The Sea of Monsters
After winning the chariot race, Clarisse is awarded a golden laurel at the camp fire which raises everyone's spirit and in turn caused the flame to grow. When Percy told everyone he knew of a way to save the camp, everyone was quiet, but the flame showed that they were all interested. However, Tantalus gave the quest to Clarisse instead of Percy, which a lot of campers thought was unfair and the campfire greatly diminished as people started leaving.

The Lost Hero
During the campfire Rachel talks about the Prophecy of Seven and begins repeating it when Jason interrupts her and finishes it in Latin. She also says that she feels that some of those in the prophecy are there tonight. She also is taken over by the spirit of the Oracle and gives another prophecy for a quest. Drew charmspeaks everyone at the campfire to convince the campers that she should be on the Quest for Hera but she is out spoken by Piper who can also charmspeak. Later Jason proved himself to be a son of Zeus (actually Jupiter) by summoning a lightning bolt to hit the campfire, putting it out.

The Lightning Thief (film)
In the Lightning Thief movie, Hades takes form in the fire and demands to see Percy Jackson saying that he had his mother. He demands for the Master Bolt.

Magical Properties
The campfire has some magical properties. The height and the color of the flames depends on the general mood of the campers. If the campers feel really excited or happy the campfire will rise over twenty feet high and turn golden. But if the campers feel grim, upset, or anxious the fire will turn into a deep shade of purple or a flimsy gray.

Trivia

 * There were only two known times the campfire was a deep shade of purple. When Tantalus was in charge instead of Chiron. And in The Lost Hero when Chiron was talking about Percy's disappearance and Jason's quest.