The Boedromia was an ancient Greek

Ancient Greece

Ancient Greece is a civilization belonging to a period of Greek history that lasted from the Archaic period of the 8th to 6th centuries BC to the end of antiquity. Immediately following this period was the beginning of the Early Middle Ages and the Byzantine era. Included in Ancient Greece is the...

 festival

Athenian festivals

The festival calendar of city-state of classical Athens involved the staging of a large number of festivals each year. These Athenian festivals included:-Athena:...

 held at Athens on the 7th of Boedromion (summer) in the honor of Apollo

Apollo

Apollo is one of the most important and complex of the Olympian deities in Greek and Roman mythology...

 Boedromios (the helper in distress). The festival had a military connotation, and thanks the god for his assistance to the Athenians during wars. It could also commemorate a specific intervention at the origin of the festival. The event in question, according to the ancient writers, could be the help brought to Theseus

Theseus

For other uses, see Theseus Theseus was the mythical founder-king of Athens, son of Aethra, and fathered by Aegeus and Poseidon, both of whom Aethra had slept with in one night. Theseus was a founder-hero, like Perseus, Cadmus, or Heracles, all of whom battled and overcame foes that were...

 in his war against the Amazons

Amazons

The Amazons are a nation of all-female warriors in Greek mythology and Classical antiquity. Herodotus placed them in a region bordering Scythia in Sarmatia...

, or the assistance provided to the king Erechtheus

Erechtheus

Erechtheus in Greek mythology was the name of an archaic king of Athens, the re-founder of the polis and a double at Athens for Poseidon, as "Poseidon Erechtheus"...

 during his struggle against Eumolpus

Eumolpus

In Greek mythology, Eumolpus was the son of Poseidon and Chione. According to Apollodorus, Chione, daughter of Boreas and Oreithyia, pregnant with Eumolpus by Poseidon, was frightened of her father's reaction so she threw the baby into the ocean...

. During the event, sacrifices were also made to Artemis

Artemis

Artemis was one of the most widely venerated of the Ancient Greek deities. Her Roman equivalent is Diana. Some scholars believe that the name and indeed the goddess herself was originally pre-Greek. Homer refers to her as Artemis Agrotera, Potnia Theron: "Artemis of the wildland, Mistress of Animals"...

 Agrotera

Agrotera

Agrotera was an epithet of the Greek goddess Artemis, and the most important goddess to Attic hunters.At Agrae on the Ilissos, where she was believed to have first hunted after her arrival from Delos, Artemis Agrotera had a temple, dating to the 5th century BC, with a statue carrying a bow...

.

Source

Dictionary of Greek and Roman Antiquities edited by William Smith (1870) p.204