Witch-Con is an annual convention, hosted outside space and time, for witches and warlocks. It is held in February.
Witch-Con typically includes displays of witching prowess, such as potion-brewing, spell-casting, and other such skills. Attendees can come from any era or location.
During the 2017 convention, an outbreak of the Weirdness resulted in the event being quarantined. Ultimately, all attendees died and went to Hell. However, this timeline was erased by the Main Trio, so it's unclear if it still occurred.
Witch-Con 2018
The 2018 convention is planned for February 23rd.