I also say it depends on the event and your beliefs. I can remember my Catholic parents specifically not attending at least one wedding because either the Bride or Groom had been married before. And I'm sure my parents would ONLY have attended a same-sex wedding in very limited circumstances (i.e., had it been a wedding for one of their children).
As a Unitarian Universalist Pagan, I'm a lot less worried about things like that.
I have not been invited to a Bris. I think that if I do receive an invitation, it would be because I was close to that family, and I would give serious consideration to attending to honor that closeness, despite my dislike of circumcision.
Coming from a Catholic background, I have no problem attending an infant baptism. I would probably have to stay silent or revise my phrasing for any promises the congregation is asked to make, but I don't see a reason not to attend.
But for you, with your concern about consent of the recipient, I think 2xy's questions are key.
|You believe that the recipient of this particular religious rite should consent to; according to your beliefs, will it harm the recipient if the rite is performed without his/her consent? Or will it just be null and void? Could the recipient elect to have the rite performed when he or she is of age to consent?