Will you help me decide how to keep this old ankle injury from flaring up again?

I twisted my ankle a year ago, and was diagnosed with sprained ligaments. It’s been pain-free for about nine months.

Yesterday, I was fluthering while walking down the stairs… I know.

Predictably Through no fault of my own, I missed a step, landing on that same ankle.

It doesn’t hurt much, but I’ve been resting it. It definitely feels unstable, like it’s held together by very loose strings. My real question is this:

In about 24 hours, I’m supposed to go see a band, about an hour’s train ride from here. I will be on my feet for at least six hours – and more importantly, I will probably not be thinking about my ankle the whole time. I know that the healing process was interrupted twice last year, and both these setbacks were caused by my not paying attention, twisting around at a sudden noise. It took three months for that ankle to feel normal again, and I hated it.

On the other hand…I really want to go to that concert, and with being almost pain-free right now, I’m thinking it may not be nearly as bad as last time.

What would you do?