So you remember the Gala for the new students event in Alfea in season 1, don't you? The one in episode 3. In the show Red Fountain and Alfea hold a party in Alfea to welcome the new students. I always wondered why it were only two of the magical schools and Cloudtower was missing.
So in my headcanon it always had been an event for all the three schools. They all worked together and held several events together to strengthen the bond between specialists, fairies and witches. However this bond broke:
In the last semester, the school year before Bloom attends Alfea, there had been an accident involving three witches and a fairy. The accident was mentioned in canon: Stella blew up the whole potion laboratory. In the show it's a funny accident, that shows how Stella has a hot temper. In my headcanon Stella didn't only blew up the potions laboratory, she also killed a witch by accident. It happened, that one night three witches entered Alfea to get Stella's ring. Stella however, was all alone, since she didn't have formed a friend group that year and the witches chased her through the nightly corridors of Alfea in order to catch her and her ring. She fled in the potions laboratory, where the witches faced her. The three witches were Icy and Darcy under the command of Lilith, a witch in her third year of Cloud Tower. Lilth has a special connection to the dragon flame and views it as her personal right to possess it. Since the royal family of Solaria inherited from the royal family in Domino (also my hc) Lilith suspected the dragon flame to be kept in Stella's ring. (False assumption as we all know.) I'll make a post on Lilith once I made her backstory up in my fanfiction. She however didn't fear any consequences. She wanted the ring and she would get it even if she had to kill for it. So she faced Stella, hurt her, tortured her (Stella has a big, fkn witch trauma) demanded the ring. Stella however all alone and scared af tried to defend herself, her powers went out of control and she blew up the whole laboratory with Lilith in it, whose body was burned to death. Icy and Darcy managed to escape and were only slightly hurt (and under shock, especially Icy who saw her friend, her leader dying. She has also a big fkn trauma and it's the reason for her hatred towards Stella. There will be only one fairy soon, whom ahe hates more). That all however wasn't made public. In fact no one really knew what happened: Faragonda and Griffin came to the conclusion that it was a usual fight between fairies and witches which went out of control. As a result Faragonda reduced the contact with Cloud Tower to a minimum and excluded it from the gala and all other events. Griffin is deeply hurt and pissed af. She always valued Faragonda as a close friend, an important friend. That friend who was once an enemy but helped her escaping Valtor. This close friend now turned her back on her and, as she sees it, betrays her. Not only did she lose her best student (Lilith), she also lost her best friend. That's why she doesn't prevent the Trix messing with the fairies. She deeply believes Lilith's death had been an accident and doesn't see the banter between Winx and Trix as something dangerous. How few she knew...