You called all your friends over to Percy's cabin to help you dye your hair, or just to act as a source of entertainment.

Rachel was the one actually putting the dye in your hair, while all your other friends were doing something else. Thalia and Percy are arm wrestling (Percy's losing, 3-1), Jason and Leo are trying their best to play chess, neither know what they're doing. Annabeth and Piper are doing their nails. Hazel and Frank are just chatting while watching the movie that was playing in the background, and Nico and Will were cuddling on the couch, Will was reading a book, and Nico was asleep.