To close out the charging aspect of this thread, it all went fairly well, on paper at least. The facilities at Englishtown road course are basic; a guard rail, a grandstand made of scaffolding and not much else. There's a junction box right in front of the grandstand so that's where I had to put the car, this was kind of neat in the sense that it gave people plenty of opportunity to check the car out when they were not driving the course. Here's a picture of the charging setup:
You can see the very long 30A line they provided, which had a NEMA L14-30 on the end (initially full of spiders!). I bought the $100 adapter from Tesla Motors and that then connects to the UMC and into the car as expected. We'd done a fair bit of groundwork - I swapped many emails with the organisers - and it was good to see the LEDs light up without any hesitation when I plugged in.
Unfortunately the heat was intense; 95-100F all day with zero shade and zero wind. One of the instructors said that Englishtown is the Death Valley of New Jersey. The car was registering 125F when I put the key in. It was drawing nominal 24A @ 220V, but only gaining about 10 ideal miles per hour charged when I had expected approx 19 MPHC. I am pretty sure this was due to the cooling system trying to cool the batteries/PEM while charging and just not having much juice left over.
As for the overall experience of the "High Performance Drivers' Ed.", it was fun but absolutely brutal due to the heat. In the early afternoon, the car's Power Limit was kicking in almost as soon as we went out onto the course. For the good of the car I did not drive in Performance mode at all.