Congregation Am Tikva is the GLBT synagogue of Boston, and where I’m a member. Temple Sinai is the Reform synagogue in Brookline’s Coolidge Corner (and is GLBT welcoming). CAT rents space at and has an interactive relationship with TS.
Seven years ago, CAT and TS created a joint Healing Service, held every other month or so and on Yom Kippur. Each is an hour of guided meditation, song, prayer, poetry and more. The Services are followed by an oneg (Hebrew "joy") -- refreshments and social time. At least once a year, the Service ends with havdalah, the ritual for the end of Shabbat (sunset Friday to sunset Saturday).
I started attending a few years ago. I’m especially glad of this one because this is the eve of the international Transgender Day of Remembrance.