Hey all, I was there too (in Richard's group, actually — I'm Marco, owning the black 1M).
Thanks for posting the video. None of my videos were captured, disappointingly — the M5, the M3, or the instructor-driven M5 hot laps. At least I can show yours to my family to explain what I did.
Otherwise, it was an awesome day. My first time ever on a track. I'd definitely do other events in the future.
Also, I don't know if this helps to clarify your 1M autocross discussion, but attached is a photo of the complete timesheet:
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