Jane,
I am not sure of your circumstances either, not sure what type of confrontation of who or what, so it makes it difficult to know what to suggest. I do think Maddog's suggestion of having support with you and around is vital. It being a major holiday makes the day more emotionally charged for everyone including yourself so I wonder at the timing, though it could be the only opportunity you have I don't know, which would make sense. Again, understand with very little to go on, this blind suggestion on my part.
Mostly, if I were in your situation I would make sure I had something with me that would keep me feeling grounded such as favorite necklace, ring, stone, or medallion to touch and feel so as not to lose yourself should anxiety begin to overcome you (I wear a necklace I've had for years that I touch and pull at that reminds me of my strength and all that I've endured.).
I hope it goes well for you, remember you are not the victim you are Survivor.
Peace,
Rain