We have been discussing this event in the forums at Geocaching:
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CO Admin forwarded your email to me, since this is part of my review area. I don't see any problems with your proposed event, as described in the forums.
If I could make one suggestion though, the first part of your cache page should describe WHAT the event is about. I only say this because I was a bit confused by the other events you provided links to. I'm not a benchmark hunter, so maybe that's my problem. You might want to consider making this event into an "introduction to benchmarking". You just might get some cachers to attend that have always been curious about benchmarking, but didn't know how to start on their own. Just a suggestion, it's your event.
When you get within 3 months of the event date, feel free to submit it as a cache event and I'll review it.