Imbolc is the time of year when I like to start new projects and endeavours. Imbolc would be an excellent time to celebrate a transition from one gender to another. It’s the time when the first signs of spring appear (at least in my neck of the woods – your local climate may vary). The goddess most closely associated with Imbolc is Brighid, goddess of smithcraft, poetry, and healing.
Some versions of the Wheel of the Year (the eight festivals of Wicca and Druidry) can feel excluding, particularly those that focus on the God and the Goddess interacting through the cycle of the seasons. This mythological construct excludes both polytheists and LGBTQIA people. Some versions of the story are uncomfortable for feminists, as they don’t exactly promote consent culture. It is worth noting that the “cycle of the God and the Goddess” doesn’t appear in any early Gardnerian Books of Shadows (e.g. November Eve, 1949, February Eve, 1949, May Eve, 1949, August Eve, 1949). The solstices and equinoxes were added to the Wiccan year-wheel in the 1950s.
For all sorts of reasons, then, I prefer to go back to the original mythology and symbolism associated with the festivals.