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What event is shown on the Parthenon’s interior frieze?

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The Parthenon temple in Athens, Greece, is illuminated at night, showing its iconic Doric columns and partially ruined structure atop the Acropolis. — Parthenon Night view of the Parthenon, Athens.

The interior frieze of the Parthenon depicts the ritual procession of the Panathenaic Festival, an ancient Athenian celebration held to honor the goddess Athena.12

The continuous low-relief sculpture, which wraps around the top of the exterior cella wall, illustrates the progression of the event:2

West End: The scene begins with officials, citizens, and young men preparing to mount their horses.2
Progression: The procession gains momentum, featuring a cavalcade of horses at a gallop.2
East End: The frieze culminates with a priest and priestess of Athena, who are flanked by two groups of seated gods.2

This work is widely considered a masterpiece of Classical architecture and Greek sculpture, noted for its rhythmic design and clarity.12