I had low 100's and it also said it was at capacity. I didn't know what to do, but fortunately, I tried opening the link on another tab after about 5 min of freaking out and I was in. Of course, then I thought I might have taken too long and it would kick me out. So now I'm in for Aug 2nd. With the extra money we pay for a Blue Card, they really need to offer more of these events so everyone can do at least one a year-without sweating it!