The key event was Hephaestus' unwanted advance towards Athena. As a virgin goddess, Athena didn't tolerate it. This led to the strange birth of Erichthonius.
The main events in their relationship were mainly about competition and power struggle. For example, in the context of Athens, they both presented their gifts to prove their worthiness as the city's patron. Also, in broader mythology, when it came to matters related to the sea and land boundaries, their interests sometimes collided. Their relationship was not based on love but on their positions as important deities in the Greek pantheon.
His birth, rejection by Hera, being raised by Thetis, becoming a great craftsman, creating amazing items like Achilles' armor, and his return to Olympus are the main events.
In Greek mythology, Athena and Hephaestus don't have a typical 'love story' in the romantic sense. Hephaestus once tried to assault Athena. But Athena, being a virgin goddess, resisted him. This event led to Hephaestus spilling his semen on the ground, which gave birth to Erichthonius in a rather strange way.
Well, Medusa was in Athena's temple with Poseidon. Athena was angry about this and turned Medusa into a monster. Later, Perseus was sent on a quest to kill Medusa. Athena guided him. He managed to behead Medusa. After that, from Medusa's blood sprang the winged horse Pegasus. So, the main events involve the transformation of Medusa and her ultimate demise at the hands of Perseus with Athena's influence.
In the Athena Medusa story, the initial event is Poseidon's inappropriate act towards Medusa within Athena's sacred temple. This act led Athena to take drastic action and transform Medusa into a terrifying Gorgon. As a Gorgon, Medusa's appearance was so dreadful that her gaze could turn any living being into stone. Then, Perseus entered the story. He was given a task to slay Medusa. Athena provided him with special tools, like a shield that could reflect Medusa's image so that he could avoid direct eye contact. With these aids, Perseus managed to cut off Medusa's head, which was a significant and dangerous accomplishment in the context of Greek mythology.
One common theme is the exploration of their different natures. Hephaestus, being the god of fire and forge, and Athena, the goddess of wisdom. Their relationship in fanfiction often delves into how these two different aspects interact. For example, how Hephaestus' practical skills might complement Athena's intellectual abilities.
One possible theme could be cooperation. As mentioned before, their different skills can lead to a great partnership. Another theme might be the contrast between their natures. Hephaestus' more physical and hands - on work compared to Athena's intellectual pursuits.
It could be a story full of creativity. Hephaestus, the god of blacksmithing, and Athena, the goddess of wisdom. Maybe it could show how Hephaestus creates amazing artifacts with the wisdom and inspiration provided by Athena. Their interactions might involve Hephaestus seeking Athena's advice on his works, and Athena being impressed by Hephaestus' craftsmanship.
One main event was her birth from Zeus's head. Another was her contest with Poseidon for Athens. She won by giving the olive tree. Also, her support of heroes like Odysseus was important.
The key event is Hephaestus trapping Aphrodite and Ares with his net. Another is their marriage which was arranged by Zeus. And also the exposure of Aphrodite's affair with Ares to the other gods.