Possible sprained ankle? Should I attend dance workshop?

I hurt my ankle in like july, and it didn't heel right. There was still something wrong with the tendon, and it didn't bend properly. Since then I have been wearing an ankle brace on that ankle well participating in physical activity. Last night my ankle got kicked in the opposite direction my body was turning. I was doing pump turns and so was someone else then they cam around I as I did and kicked my foot inwards. I couldn't walk on it last night, but I can walk on it now. It hurts the most in the back of my foot though when I walk on it. (Like that little part where it usually hurts to touch, bellow the calf?) I can't bend it though, maybe like a cm but it hurts. I am signed up to go to an intensive ballet workshop for four days. We dance 8 hours a day and get an hour lunch break. I don't think my ankle can take this. My mom is trying to make me go though, do you think I should just suck it up and go???