The son of Peleus now brought out the prizes for the third contest and showed them to the Argives. These were for the pain- ful art of wrestling. For the winner there was a great tripod ready for setting upon the fire, and the Achaeans valued it among themselves at twelve oxen.
~ The Iliad - Book XXIII (Samuel Butler Translation. p168 / v700)
Patroclus appears to Achilles in a dream and asks him not to hold off on the funeral any longer. Achilles does so in a grand ceremony. He organizes games in Patroclus’ honor, and all the warriors participate. They play games like chariot racing, boxing, wrestling, foot racing, archery, javelin throwing, etc.
Book 23 of The Iliad is mainly about games Achilles organizes after Patroclus’ funeral in his honor. The games provide a temporary respite from the horrific war and bring everyone together.