Don't you hate it when you realize that the f/2.8 lens(es) you brought are WAY too slow for the event? I think we've all done that one before. I hope you're able to get something out of the shots in post.
Oh, I knew that going in - I have f/1.4 and f/1.2 primes I could have brought, and a 600EX-RT on the camera that I chose not to use, despite several iPhone, P&S, and Rebel-on-full-auto lights/strobes disturbing the ambiance. I hadn't planned on any keepers from that activity (one of several, others are better lit, it's an annual event we attend). FWIW, I brought the 35/1.4L last year, and didn't get any keepers from the fireside stories, either. I grabbed a few shots this time on a lark, just to see how PRIME would handle them (I think it's the first time I've taken any non-test shots above ISO 25,600).
Neuro, I'd be very keen to see some of your shots from your daughter's Halloween event (including 'before and after post processing' comparos, both to see the detail of the IDX at high ISO's, and what DxO v9 can do with them).
I've been using DxO since v5, and love what it can do, particularly with its useful batch post-processing improvement capabilities. So when the DxO Optics Pro 9 came up in my email telling about PRIME, I became interested.... and there are still some weeks the upgrade offer is valid till.
Will keep an eye out...